<?php

/**

* Main WordPress Formatting API.

*

* Handles many functions for formatting output.

*

* @package WordPress

*/

/**

* Replaces common plain text characters into formatted entities

*

* As an example,

* <code>

* 'cause today's effort makes it worth tomorrow's "holiday"...

* </code>

* Becomes:

* <code>

* &#8217;cause today&#8217;s effort makes it worth tomorrow&#8217;s &#8220;holiday&#8221;&#8230;

* </code>

* Code within certain html blocks are skipped.

*

* @since 0.71

* @uses $wp_cockneyreplace Array of formatted entities for certain common phrases

*

* @param string $text The text to be formatted

* @return string The string replaced with html entities

*/

function wptexturize($text) {

global $wp_cockneyreplace;

static $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements,

$default_no_texturize_tags, $default_no_texturize_shortcodes;

// No need to set up these static variables more than once

if ( ! isset( $static_characters ) ) {

/* translators: opening curly double quote */

$opening_quote = _x( '&#8220;', 'opening curly double quote' );

/* translators: closing curly double quote */

$closing_quote = _x( '&#8221;', 'closing curly double quote' );

/* translators: apostrophe, for example in 'cause or can't */

$apos = _x( '&#8217;', 'apostrophe' );

/* translators: prime, for example in 9' (nine feet) */

$prime = _x( '&#8242;', 'prime' );

/* translators: double prime, for example in 9" (nine inches) */

$double_prime = _x( '&#8243;', 'double prime' );

/* translators: opening curly single quote */

$opening_single_quote = _x( '&#8216;', 'opening curly single quote' );

/* translators: closing curly single quote */

$closing_single_quote = _x( '&#8217;', 'closing curly single quote' );

/* translators: en dash */

$en_dash = _x( '&#8211;', 'en dash' );

/* translators: em dash */

$em_dash = _x( '&#8212;', 'em dash' );

$default_no_texturize_tags = array('pre', 'code', 'kbd', 'style', 'script', 'tt');

$default_no_texturize_shortcodes = array('code');

// if a plugin has provided an autocorrect array, use it

if ( isset($wp_cockneyreplace) ) {

$cockney = array_keys($wp_cockneyreplace);

$cockneyreplace = array_values($wp_cockneyreplace);

} elseif ( "'" != $apos ) { // Only bother if we're doing a replacement.

$cockney = array( "'tain't", "'twere", "'twas", "'tis", "'twill", "'til", "'bout", "'nuff", "'round", "'cause" );

$cockneyreplace = array( $apos . "tain" . $apos . "t", $apos . "twere", $apos . "twas", $apos . "tis", $apos . "twill", $apos . "til", $apos . "bout", $apos . "nuff", $apos . "round", $apos . "cause" );

} else {

$cockney = $cockneyreplace = array();

}

$static_characters = array_merge( array( '---', ' -- ', '--', ' - ', 'xn&#8211;', '...', '``', '\'\'', ' (tm)' ), $cockney );

$static_replacements = array_merge( array( $em_dash, ' ' . $em_dash . ' ', $en_dash, ' ' . $en_dash . ' ', 'xn--', '&#8230;', $opening_quote, $closing_quote, ' &#8482;' ), $cockneyreplace );

/*

* Regex for common whitespace characters.

*

* By default, spaces include new lines, tabs, nbsp entities, and the UTF-8 nbsp.

* This is designed to replace the PCRE \s sequence. In #WP22692, that sequence

* was found to be unreliable due to random inclusion of the A0 byte.

*/

$spaces = '[\r\n\t ]|\xC2\xA0|&nbsp;';

// Pattern-based replacements of characters.

$dynamic = array();

// '99 '99s '99's (apostrophe)

if ( "'" !== $apos ) {

$dynamic[ '/\'(?=\d)/' ] = $apos;

}

// Single quote at start, or preceded by (, {, <, [, ", or spaces.

if ( "'" !== $opening_single_quote ) {

$dynamic[ '/(?<=\A|[([{<"]|' . $spaces . ')\'/' ] = $opening_single_quote;

}

// 9" (double prime)

if ( '"' !== $double_prime ) {

$dynamic[ '/(?<=\d)"/' ] = $double_prime;

}

// 9' (prime)

if ( "'" !== $prime ) {

$dynamic[ '/(?<=\d)\'/' ] = $prime;

}

// Apostrophe in a word. No spaces or double primes.

if ( "'" !== $apos ) {

$dynamic[ '/(?<!' . $spaces . ')\'(?!\'|' . $spaces . ')/' ] = $apos;

}

// Double quote at start, or preceded by (, {, <, [, or spaces, and not followed by spaces.

if ( '"' !== $opening_quote ) {

$dynamic[ '/(?<=\A|[([{<]|' . $spaces . ')"(?!' . $spaces . ')/' ] = $opening_quote;

}

// Any remaining double quotes.

if ( '"' !== $closing_quote ) {

$dynamic[ '/"/' ] = $closing_quote;

}

// Single quotes followed by spaces or a period.

if ( "'" !== $closing_single_quote ) {

$dynamic[ '/\'(?=\Z|\.|' . $spaces . ')/' ] = $closing_single_quote;

}

$dynamic_characters = array_keys( $dynamic );

$dynamic_replacements = array_values( $dynamic );

}

// Transform into regexp sub-expression used in _wptexturize_pushpop_element

// Must do this every time in case plugins use these filters in a context sensitive manner

/**

* Filter the list of HTML elements not to texturize.

*

* @since 2.8.0

*

* @param array $default_no_texturize_tags An array of HTML element names.

*/

$no_texturize_tags = '(' . implode( '|', apply_filters( 'no_texturize_tags', $default_no_texturize_tags ) ) . ')';

/**

* Filter the list of shortcodes not to texturize.

*

* @since 2.8.0

*

* @param array $default_no_texturize_shortcodes An array of shortcode names.

*/

$no_texturize_shortcodes = '(' . implode( '|', apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes ) ) . ')';

$no_texturize_tags_stack = array();

$no_texturize_shortcodes_stack = array();

// Look for shortcodes and HTML elements.

$shortcode_regex =

'\[' // Find start of shortcode.

. '[^\[\]<>]++' // Shortcodes do not contain other shortcodes. Possessive critical.

. '\]'; // Find end of shortcode.

$textarr = preg_split("/(<[^>]*>|$shortcode_regex)/s", $text, -1, PREG_SPLIT_DELIM_CAPTURE);

foreach ( $textarr as &$curl ) {

if ( empty( $curl ) ) {

continue;

}

// Only call _wptexturize_pushpop_element if first char is correct tag opening

$first = $curl[0];

if ( '<' === $first ) {

_wptexturize_pushpop_element($curl, $no_texturize_tags_stack, $no_texturize_tags, '<', '>');

} elseif ( '[' === $first && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {

_wptexturize_pushpop_element($curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes, '[', ']');

} elseif ( empty($no_texturize_shortcodes_stack) && empty($no_texturize_tags_stack) ) {

// This is not a tag, nor is the texturization disabled static strings

$curl = str_replace($static_characters, $static_replacements, $curl);

// regular expressions

$curl = preg_replace($dynamic_characters, $dynamic_replacements, $curl);

// 9x9 (times)

if ( 1 === preg_match( '/(?<=\d)x\d/', $text ) ) {

// Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!

$curl = preg_replace( '/\b(\d+)x(\d+)\b/', '$1&#215;$2', $curl );

}

}

// Replace each & with &#038; unless it already looks like an entity.

$curl = preg_replace('/&([^#])(?![a-zA-Z1-4]{1,8};)/', '&#038;$1', $curl);

}

return implode( '', $textarr );

}

/**

* Search for disabled element tags. Push element to stack on tag open and pop

* on tag close. Assumes first character of $text is tag opening.

*

* @since 2.9.0

* @access private

*

* @param string $text Text to check. First character is assumed to be $opening

* @param array $stack Array used as stack of opened tag elements

* @param string $disabled_elements Tags to match against formatted as regexp sub-expression

* @param string $opening Tag opening character, assumed to be 1 character long

* @param string $closing Tag closing character

*/

function _wptexturize_pushpop_element($text, &$stack, $disabled_elements, $opening = '<', $closing = '>') {

// Check if it is a closing tag -- otherwise assume opening tag

if (strncmp($opening . '/', $text, 2)) {

// Opening? Check $text+1 against disabled elements

if (preg_match('/^' . $disabled_elements . '\b/', substr($text, 1), $matches)) {

/*

* This disables texturize until we find a closing tag of our type

* (e.g. <pre>) even if there was invalid nesting before that

*

* Example: in the case <pre>sadsadasd</code>"baba"</pre>

* "baba" won't be texturize

*/

array_push($stack, $matches[1]);

}

} elseif ( 0 == count( $stack ) ) {

// Stack is empty. Just stop.

} else {

// Closing? Check $text+2 against disabled elements

$c = preg_quote($closing, '/');

if (preg_match('/^' . $disabled_elements . $c . '/', substr($text, 2), $matches)) {

$last = array_pop($stack);

// Make sure it matches the opening tag

if ( $last != $matches[1] ) {

array_push( $stack, $last );

}

}

}

}

/**

* Replaces double line-breaks with paragraph elements.

*

* A group of regex replaces used to identify text formatted with newlines and

* replace double line-breaks with HTML paragraph tags. The remaining

* line-breaks after conversion become <<br />> tags, unless $br is set to '0'

* or 'false'.

*

* @since 0.71

*

* @param string $pee The text which has to be formatted.

* @param bool $br Optional. If set, this will convert all remaining line-breaks after paragraphing. Default true.

* @return string Text which has been converted into correct paragraph tags.

*/

function wpautop($pee, $br = true) {

$pre_tags = array();

if ( trim($pee) === '' )

return '';

$pee = $pee . "\n"; // just to make things a little easier, pad the end

if ( strpos($pee, '<pre') !== false ) {

$pee_parts = explode( '</pre>', $pee );

$last_pee = array_pop($pee_parts);

$pee = '';

$i = 0;

foreach ( $pee_parts as $pee_part ) {

$start = strpos($pee_part, '<pre');

// Malformed html?

if ( $start === false ) {

$pee .= $pee_part;

continue;

}

$name = "<pre wp-pre-tag-$i></pre>";

$pre_tags[$name] = substr( $pee_part, $start ) . '</pre>';

$pee .= substr( $pee_part, 0, $start ) . $name;

$i++;

}

$pee .= $last_pee;

}

$pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);

// Space things out a little

$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|noscript|legend|section|article|aside|hgroup|header|footer|nav|figure|details|menu|summary)';

$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);

$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);

$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines

// Find newlines in all elements and add placeholders.

$pee = wp_replace_in_html_tags( $pee, array( "\n" => " <!-- wpnl --> " ) );

if ( strpos( $pee, '</object>' ) !== false ) {

// no P/BR around param and embed

$pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );

$pee = preg_replace( '|\s*</object>|', '</object>', $pee );

$pee = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $pee );

}

if ( strpos( $pee, '<source' ) !== false || strpos( $pee, '<track' ) !== false ) {

// no P/BR around source and track

$pee = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $pee );

$pee = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $pee );

$pee = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $pee );

}

$pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates

// make paragraphs, including one at the end

$pees = preg_split('/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY);

$pee = '';

foreach ( $pees as $tinkle ) {

$pee .= '<p>' . trim($tinkle, "\n") . "</p>\n";

}

$pee = preg_replace('|<p>\s*</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace

$pee = preg_replace('!<p>([^<]+)</(div|address|form)>!', "<p>$1</p></$2>", $pee);

$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag

$pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists

$pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);

$pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);

$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)!', "$1", $pee);

$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee);

if ( $br ) {

$pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee);

$pee = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $pee); // optionally make line breaks

$pee = str_replace('<WPPreserveNewline />', "\n", $pee);

}

$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*<br />!', "$1", $pee);

$pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee);

$pee = preg_replace( "|\n</p>$|", '</p>', $pee );

if ( !empty($pre_tags) )

$pee = str_replace(array_keys($pre_tags), array_values($pre_tags), $pee);

// Restore newlines in all elements.

$pee = str_replace( " <!-- wpnl --> ", "\n", $pee );

return $pee;

}

/**

* Separate HTML elements and comments from the text.

*

* @since 4.2.4

*

* @param string $input The text which has to be formatted.

* @return array The formatted text.

*/

function wp_html_split( $input ) {

static $regex;

if ( ! isset( $regex ) ) {

$comments =

'!' // Start of comment, after the <.

. '(?:' // Unroll the loop: Consume everything until --> is found.

. '-(?!->)' // Dash not followed by end of comment.

. '[^\-]*+' // Consume non-dashes.

. ')*+' // Loop possessively.

. '(?:-->)?'; // End of comment. If not found, match all input.

$cdata =

'!\[CDATA\[' // Start of comment, after the <.

. '[^\]]*+' // Consume non-].

. '(?:' // Unroll the loop: Consume everything until ]]> is found.

. '](?!]>)' // One ] not followed by end of comment.

. '[^\]]*+' // Consume non-].

. ')*+' // Loop possessively.

. '(?:]]>)?'; // End of comment. If not found, match all input.

$regex =

'/(' // Capture the entire match.

. '<' // Find start of element.

. '(?(?=!--)' // Is this a comment?

. $comments // Find end of comment.

. '|'

. '(?(?=!\[CDATA\[)' // Is this a comment?

. $cdata // Find end of comment.

. '|'

. '[^>]*>?' // Find end of element. If not found, match all input.

. ')'

. ')'

. ')/s';

}

return preg_split( $regex, $input, -1, PREG_SPLIT_DELIM_CAPTURE );

}

/**

* Replace characters or phrases within HTML elements only.

*

* @since 4.2.3

*

* @param string $haystack The text which has to be formatted.

* @param array $replace_pairs In the form array('from' => 'to', ...).

* @return string The formatted text.

*/

function wp_replace_in_html_tags( $haystack, $replace_pairs ) {

// Find all elements.

$textarr = wp_html_split( $haystack );

$changed = false;

// Optimize when searching for one item.

if ( 1 === count( $replace_pairs ) ) {

// Extract $needle and $replace.

foreach ( $replace_pairs as $needle => $replace );

// Loop through delimeters (elements) only.

for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {

if ( false !== strpos( $textarr[$i], $needle ) ) {

$textarr[$i] = str_replace( $needle, $replace, $textarr[$i] );

$changed = true;

}

}

} else {

// Extract all $needles.

$needles = array_keys( $replace_pairs );

// Loop through delimeters (elements) only.

for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {

foreach ( $needles as $needle ) {

if ( false !== strpos( $textarr[$i], $needle ) ) {

$textarr[$i] = strtr( $textarr[$i], $replace_pairs );

$changed = true;

// After one strtr() break out of the foreach loop and look at next element.

break;

}

}

}

}

if ( $changed ) {

$haystack = implode( $textarr );

}

return $haystack;

}

/**

* Newline preservation help function for wpautop

*

* @since 3.1.0

* @access private

*

* @param array $matches preg_replace_callback matches array

* @return string

*/

function _autop_newline_preservation_helper( $matches ) {

return str_replace("\n", "<WPPreserveNewline />", $matches[0]);

}

/**

* Don't auto-p wrap shortcodes that stand alone

*

* Ensures that shortcodes are not wrapped in <<p>>...<</p>>.

*

* @since 2.9.0

*

* @param string $pee The content.

* @return string The filtered content.

*/

function shortcode_unautop( $pee ) {

global $shortcode_tags;

if ( empty( $shortcode_tags ) || !is_array( $shortcode_tags ) ) {

return $pee;

}

$tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );

$pattern =

'/'

. '<p>' // Opening paragraph

. '\\s*+' // Optional leading whitespace

. '(' // 1: The shortcode

. '\\[' // Opening bracket

. "($tagregexp)" // 2: Shortcode name

. '(?![\\w-])' // Not followed by word character or hyphen

// Unroll the loop: Inside the opening shortcode tag

. '[^\\]\\/]*' // Not a closing bracket or forward slash

. '(?:'

. '\\/(?!\\])' // A forward slash not followed by a closing bracket

. '[^\\]\\/]*' // Not a closing bracket or forward slash

. ')*?'

. '(?:'

. '\\/\\]' // Self closing tag and closing bracket

. '|'

. '\\]' // Closing bracket

. '(?:' // Unroll the loop: Optionally, anything between the opening and closing shortcode tags

. '[^\\[]*+' // Not an opening bracket

. '(?:'

. '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag

. '[^\\[]*+' // Not an opening bracket

. ')*+'

. '\\[\\/\\2\\]' // Closing shortcode tag

. ')?'

. ')'

. ')'

. '\\s*+' // optional trailing whitespace

. '<\\/p>' // closing paragraph

. '/s';

return preg_replace( $pattern, '$1', $pee );

}

/**

* Checks to see if a string is utf8 encoded.

*

* NOTE: This function checks for 5-Byte sequences, UTF8

* has Bytes Sequences with a maximum length of 4.

*

* @author bmorel at ssi dot fr (modified)

* @since 1.2.1

*

* @param string $str The string to be checked

* @return bool True if $str fits a UTF-8 model, false otherwise.

*/

function seems_utf8($str) {

$length = strlen($str);

for ($i=0; $i < $length; $i++) {

$c = ord($str[$i]);

if ($c < 0x80) $n = 0; # 0bbbbbbb

elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb

elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb

elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb

elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb

elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b

else return false; # Does not match any model

for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?

if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))

return false;

}

}

return true;

}

/**

* Converts a number of special characters into their HTML entities.

*

* Specifically deals with: &, <, >, ", and '.

*

* $quote_style can be set to ENT_COMPAT to encode " to

* &quot;, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.

*

* @since 1.2.2

* @access private

*

* @param string $string The text which is to be encoded.

* @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.

* @param string $charset Optional. The character encoding of the string. Default is false.

* @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.

* @return string The encoded text with HTML entities.

*/

function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {

$string = (string) $string;

if ( 0 === strlen( $string ) )

return '';

// Don't bother if there are no specialchars - saves some processing

if ( ! preg_match( '/[&<>"\']/', $string ) )

return $string;

// Account for the previous behaviour of the function when the $quote_style is not an accepted value

if ( empty( $quote_style ) )

$quote_style = ENT_NOQUOTES;

elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )

$quote_style = ENT_QUOTES;

// Store the site charset as a static to avoid multiple calls to wp_load_alloptions()

if ( ! $charset ) {

static $_charset;

if ( ! isset( $_charset ) ) {

$alloptions = wp_load_alloptions();

$_charset = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';

}

$charset = $_charset;

}

if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ) ) )

$charset = 'UTF-8';

$_quote_style = $quote_style;

if ( $quote_style === 'double' ) {

$quote_style = ENT_COMPAT;

$_quote_style = ENT_COMPAT;

} elseif ( $quote_style === 'single' ) {

$quote_style = ENT_NOQUOTES;

}

// Handle double encoding ourselves

if ( $double_encode ) {

$string = @htmlspecialchars( $string, $quote_style, $charset );

} else {

// Decode &amp; into &

$string = wp_specialchars_decode( $string, $_quote_style );

// Guarantee every &entity; is valid or re-encode the &

$string = wp_kses_normalize_entities( $string );

// Now re-encode everything except &entity;

$string = preg_split( '/(&#?x?[0-9a-z]+;)/i', $string, -1, PREG_SPLIT_DELIM_CAPTURE );

for ( $i = 0; $i < count( $string ); $i += 2 )

$string[$i] = @htmlspecialchars( $string[$i], $quote_style, $charset );

$string = implode( '', $string );

}

// Backwards compatibility

if ( 'single' === $_quote_style )

$string = str_replace( "'", '&#039;', $string );

return $string;

}

/**

* Converts a number of HTML entities into their special characters.

*

* Specifically deals with: &, <, >, ", and '.

*

* $quote_style can be set to ENT_COMPAT to decode " entities,

* or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.

*

* @since 2.8.0

*

* @param string $string The text which is to be decoded.

* @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old _wp_specialchars() values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.

* @return string The decoded text without HTML entities.

*/

function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {

$string = (string) $string;

if ( 0 === strlen( $string ) ) {

return '';

}

// Don't bother if there are no entities - saves a lot of processing

if ( strpos( $string, '&' ) === false ) {

return $string;

}

// Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value

if ( empty( $quote_style ) ) {

$quote_style = ENT_NOQUOTES;

} elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {

$quote_style = ENT_QUOTES;

}

// More complete than get_html_translation_table( HTML_SPECIALCHARS )

$single = array( '&#039;' => '\'', '&#x27;' => '\'' );

$single_preg = array( '/&#0*39;/' => '&#039;', '/&#x0*27;/i' => '&#x27;' );

$double = array( '&quot;' => '"', '&#034;' => '"', '&#x22;' => '"' );

$double_preg = array( '/&#0*34;/' => '&#034;', '/&#x0*22;/i' => '&#x22;' );

$others = array( '&lt;' => '<', '&#060;' => '<', '&gt;' => '>', '&#062;' => '>', '&amp;' => '&', '&#038;' => '&', '&#x26;' => '&' );

$others_preg = array( '/&#0*60;/' => '&#060;', '/&#0*62;/' => '&#062;', '/&#0*38;/' => '&#038;', '/&#x0*26;/i' => '&#x26;' );

if ( $quote_style === ENT_QUOTES ) {

$translation = array_merge( $single, $double, $others );

$translation_preg = array_merge( $single_preg, $double_preg, $others_preg );

} elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {

$translation = array_merge( $double, $others );

$translation_preg = array_merge( $double_preg, $others_preg );

} elseif ( $quote_style === 'single' ) {

$translation = array_merge( $single, $others );

$translation_preg = array_merge( $single_preg, $others_preg );

} elseif ( $quote_style === ENT_NOQUOTES ) {

$translation = $others;

$translation_preg = $others_preg;

}

// Remove zero padding on numeric entities

$string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );

// Replace characters according to translation table

return strtr( $string, $translation );

}

/**

* Checks for invalid UTF8 in a string.

*

* @since 2.8.0

*

* @param string $string The text which is to be checked.

* @param boolean $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.

* @return string The checked text.

*/

function wp_check_invalid_utf8( $string, $strip = false ) {

$string = (string) $string;

if ( 0 === strlen( $string ) ) {

return '';

}

// Store the site charset as a static to avoid multiple calls to get_option()

static $is_utf8;

if ( !isset( $is_utf8 ) ) {

$is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );

}

if ( !$is_utf8 ) {

return $string;

}

// Check for support for utf8 in the installed PCRE library once and store the result in a static

static $utf8_pcre;

if ( !isset( $utf8_pcre ) ) {

$utf8_pcre = @preg_match( '/^./u', 'a' );

}

// We can't demand utf8 in the PCRE installation, so just return the string in those cases

if ( !$utf8_pcre ) {

return $string;

}

// preg_match fails when it encounters invalid UTF8 in $string

if ( 1 === @preg_match( '/^./us', $string ) ) {

return $string;

}

// Attempt to strip the bad chars if requested (not recommended)

if ( $strip && function_exists( 'iconv' ) ) {

return iconv( 'utf-8', 'utf-8', $string );

}

return '';

}

/**

* Encode the Unicode values to be used in the URI.

*

* @since 1.5.0

*

* @param string $utf8_string

* @param int $length Max length of the string

* @return string String with Unicode encoded for URI.

*/

function utf8_uri_encode( $utf8_string, $length = 0 ) {

$unicode = '';

$values = array();

$num_octets = 1;

$unicode_length = 0;

$string_length = strlen( $utf8_string );

for ($i = 0; $i < $string_length; $i++ ) {

$value = ord( $utf8_string[ $i ] );

if ( $value < 128 ) {

if ( $length && ( $unicode_length >= $length ) )

break;

$unicode .= chr($value);

$unicode_length++;

} else {

if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;

$values[] = $value;

if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )

break;

if ( count( $values ) == $num_octets ) {

if ($num_octets == 3) {

$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);

$unicode_length += 9;

} else {

$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);

$unicode_length += 6;

}

$values = array();

$num_octets = 1;

}

}

}

return $unicode;

}

/**

* Converts all accent characters to ASCII characters.

*

* If there are no accent characters, then the string given is just returned.

*

* @since 1.2.1

*

* @param string $string Text that might have accent characters

* @return string Filtered string with replaced "nice" characters.

*/

function remove_accents($string) {

if ( !preg_match('/[\x80-\xff]/', $string) )

return $string;

if (seems_utf8($string)) {

$chars = array(

// Decompositions for Latin-1 Supplement

chr(194).chr(170) => 'a', chr(194).chr(186) => 'o',

chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',

chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',

chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',

chr(195).chr(134) => 'AE',chr(195).chr(135) => 'C',

chr(195).chr(136) => 'E', chr(195).chr(137) => 'E',

chr(195).chr(138) => 'E', chr(195).chr(139) => 'E',

chr(195).chr(140) => 'I', chr(195).chr(141) => 'I',

chr(195).chr(142) => 'I', chr(195).chr(143) => 'I',

chr(195).chr(144) => 'D', chr(195).chr(145) => 'N',

chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',

chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',

chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',

chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',

chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',

chr(195).chr(158) => 'TH',chr(195).chr(159) => 's',

chr(195).chr(160) => 'a', chr(195).chr(161) => 'a',

chr(195).chr(162) => 'a', chr(195).chr(163) => 'a',

chr(195).chr(164) => 'a', chr(195).chr(165) => 'a',

chr(195).chr(166) => 'ae',chr(195).chr(167) => 'c',

chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',

chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',

chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',

chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',

chr(195).chr(176) => 'd', chr(195).chr(177) => 'n',

chr(195).chr(178) => 'o', chr(195).chr(179) => 'o',

chr(195).chr(180) => 'o', chr(195).chr(181) => 'o',

chr(195).chr(182) => 'o', chr(195).chr(184) => 'o',

chr(195).chr(185) => 'u', chr(195).chr(186) => 'u',

chr(195).chr(187) => 'u', chr(195).chr(188) => 'u',

chr(195).chr(189) => 'y', chr(195).chr(190) => 'th',

chr(195).chr(191) => 'y', chr(195).chr(152) => 'O',

// Decompositions for Latin Extended-A

chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',

chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',

chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',

chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',

chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',

chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',

chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',

chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',

chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',

chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',

chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',

chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',

chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',

chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',

chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',

chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',

chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',

chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',

chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',

chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',

chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',

chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',

chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',

chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',

chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',

chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',

chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',

chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',

chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',

chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',

chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',

chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',

chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',

chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',

chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',

chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',

chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',

chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',

chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',

chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',

chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',

chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',

chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',

chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',

chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',

chr(197).chr(154) => 'S',chr(197).chr(155) => 's',

chr(197).chr(156) => 'S',chr(197).chr(157) => 's',

chr(197).chr(158) => 'S',chr(197).chr(159) => 's',

chr(197).chr(160) => 'S', chr(197).chr(161) => 's',

chr(197).chr(162) => 'T', chr(197).chr(163) => 't',

chr(197).chr(164) => 'T', chr(197).chr(165) => 't',

chr(197).chr(166) => 'T', chr(197).chr(167) => 't',

chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',

chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',

chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',

chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',

chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',

chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',

chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',

chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',

chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',

chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',

chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',

chr(197).chr(190) => 'z', chr(197).chr(191) => 's',

// Decompositions for Latin Extended-B

chr(200).chr(152) => 'S', chr(200).chr(153) => 's',

chr(200).chr(154) => 'T', chr(200).chr(155) => 't',

// Euro Sign

chr(226).chr(130).chr(172) => 'E',

// GBP (Pound) Sign

chr(194).chr(163) => '',

// Vowels with diacritic (Vietnamese)

// unmarked

chr(198).chr(160) => 'O', chr(198).chr(161) => 'o',

chr(198).chr(175) => 'U', chr(198).chr(176) => 'u',

// grave accent

chr(225).chr(186).chr(166) => 'A', chr(225).chr(186).chr(167) => 'a',

chr(225).chr(186).chr(176) => 'A', chr(225).chr(186).chr(177) => 'a',

chr(225).chr(187).chr(128) => 'E', chr(225).chr(187).chr(129) => 'e',

chr(225).chr(187).chr(146) => 'O', chr(225).chr(187).chr(147) => 'o',

chr(225).chr(187).chr(156) => 'O', chr(225).chr(187).chr(157) => 'o',

chr(225).chr(187).chr(170) => 'U', chr(225).chr(187).chr(171) => 'u',

chr(225).chr(187).chr(178) => 'Y', chr(225).chr(187).chr(179) => 'y',

// hook

chr(225).chr(186).chr(162) => 'A', chr(225).chr(186).chr(163) => 'a',

chr(225).chr(186).chr(168) => 'A', chr(225).chr(186).chr(169) => 'a',

chr(225).chr(186).chr(178) => 'A', chr(225).chr(186).chr(179) => 'a',

chr(225).chr(186).chr(186) => 'E', chr(225).chr(186).chr(187) => 'e',

chr(225).chr(187).chr(130) => 'E', chr(225).chr(187).chr(131) => 'e',

chr(225).chr(187).chr(136) => 'I', chr(225).chr(187).chr(137) => 'i',

chr(225).chr(187).chr(142) => 'O', chr(225).chr(187).chr(143) => 'o',

chr(225).chr(187).chr(148) => 'O', chr(225).chr(187).chr(149) => 'o',

chr(225).chr(187).chr(158) => 'O', chr(225).chr(187).chr(159) => 'o',

chr(225).chr(187).chr(166) => 'U', chr(225).chr(187).chr(167) => 'u',

chr(225).chr(187).chr(172) => 'U', chr(225).chr(187).chr(173) => 'u',

chr(225).chr(187).chr(182) => 'Y', chr(225).chr(187).chr(183) => 'y',

// tilde

chr(225).chr(186).chr(170) => 'A', chr(225).chr(186).chr(171) => 'a',

chr(225).chr(186).chr(180) => 'A', chr(225).chr(186).chr(181) => 'a',

chr(225).chr(186).chr(188) => 'E', chr(225).chr(186).chr(189) => 'e',

chr(225).chr(187).chr(132) => 'E', chr(225).chr(187).chr(133) => 'e',

chr(225).chr(187).chr(150) => 'O', chr(225).chr(187).chr(151) => 'o',

chr(225).chr(187).chr(160) => 'O', chr(225).chr(187).chr(161) => 'o',

chr(225).chr(187).chr(174) => 'U', chr(225).chr(187).chr(175) => 'u',

chr(225).chr(187).chr(184) => 'Y', chr(225).chr(187).chr(185) => 'y',

// acute accent

chr(225).chr(186).chr(164) => 'A', chr(225).chr(186).chr(165) => 'a',

chr(225).chr(186).chr(174) => 'A', chr(225).chr(186).chr(175) => 'a',

chr(225).chr(186).chr(190) => 'E', chr(225).chr(186).chr(191) => 'e',

chr(225).chr(187).chr(144) => 'O', chr(225).chr(187).chr(145) => 'o',

chr(225).chr(187).chr(154) => 'O', chr(225).chr(187).chr(155) => 'o',

chr(225).chr(187).chr(168) => 'U', chr(225).chr(187).chr(169) => 'u',

// dot below

chr(225).chr(186).chr(160) => 'A', chr(225).chr(186).chr(161) => 'a',

chr(225).chr(186).chr(172) => 'A', chr(225).chr(186).chr(173) => 'a',

chr(225).chr(186).chr(182) => 'A', chr(225).chr(186).chr(183) => 'a',

chr(225).chr(186).chr(184) => 'E', chr(225).chr(186).chr(185) => 'e',

chr(225).chr(187).chr(134) => 'E', chr(225).chr(187).chr(135) => 'e',

chr(225).chr(187).chr(138) => 'I', chr(225).chr(187).chr(139) => 'i',

chr(225).chr(187).chr(140) => 'O', chr(225).chr(187).chr(141) => 'o',

chr(225).chr(187).chr(152) => 'O', chr(225).chr(187).chr(153) => 'o',

chr(225).chr(187).chr(162) => 'O', chr(225).chr(187).chr(163) => 'o',

chr(225).chr(187).chr(164) => 'U', chr(225).chr(187).chr(165) => 'u',

chr(225).chr(187).chr(176) => 'U', chr(225).chr(187).chr(177) => 'u',

chr(225).chr(187).chr(180) => 'Y', chr(225).chr(187).chr(181) => 'y',

// Vowels with diacritic (Chinese, Hanyu Pinyin)

chr(201).chr(145) => 'a',

// macron

chr(199).chr(149) => 'U', chr(199).chr(150) => 'u',

// acute accent

chr(199).chr(151) => 'U', chr(199).chr(152) => 'u',

// caron

chr(199).chr(141) => 'A', chr(199).chr(142) => 'a',

chr(199).chr(143) => 'I', chr(199).chr(144) => 'i',

chr(199).chr(145) => 'O', chr(199).chr(146) => 'o',

chr(199).chr(147) => 'U', chr(199).chr(148) => 'u',

chr(199).chr(153) => 'U', chr(199).chr(154) => 'u',

// grave accent

chr(199).chr(155) => 'U', chr(199).chr(156) => 'u',

);

// Used for locale-specific rules

$locale = get_locale();

if ( 'de_DE' == $locale ) {

$chars[ chr(195).chr(132) ] = 'Ae';

$chars[ chr(195).chr(164) ] = 'ae';

$chars[ chr(195).chr(150) ] = 'Oe';

$chars[ chr(195).chr(182) ] = 'oe';

$chars[ chr(195).chr(156) ] = 'Ue';

$chars[ chr(195).chr(188) ] = 'ue';

$chars[ chr(195).chr(159) ] = 'ss';

} elseif ( 'da_DK' === $locale ) {

$chars[ chr(195).chr(134) ] = 'Ae';

$chars[ chr(195).chr(166) ] = 'ae';

$chars[ chr(195).chr(152) ] = 'Oe';

$chars[ chr(195).chr(184) ] = 'oe';

$chars[ chr(195).chr(133) ] = 'Aa';

$chars[ chr(195).chr(165) ] = 'aa';

}

$string = strtr($string, $chars);

} else {

// Assume ISO-8859-1 if not UTF-8

$chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)

.chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)

.chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202)