public/main/inc/lib/text.lib.php
<?php
/* For licensing terms, see /license.txt */
/**
* This is the text library for Chamilo.
* It is loaded during the global initialization,
* so the functions below are available everywhere.
*/
define('EXERCISE_NUMBER_OF_DECIMALS', 2);
/* XML processing functions */
// A regular expression for accessing declared encoding within xml-formatted text.
// Published by Steve Minutillo,
// http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss/
define('_PCRE_XML_ENCODING', '/<\?xml.*encoding=[\'"](.*?)[\'"].*\?>/m');
/**
* This function strips all html-tags found in the input string and outputs a pure text.
* Mostly, the function is to be used before language or encoding detection of the input string.
*
* @param string $string the input string with html-tags to be converted to plain text
*
* @return string the returned plain text as a result
*/
function api_html_to_text($string)
{
// These purifications have been found experimentally, for nice looking output.
$string = preg_replace('/<br[^>]*>/i', "\n", $string);
$string = preg_replace('/<\/?(div|p|h[1-6]|table|ol|ul|blockquote)[^>]*>/i', "\n", $string);
$string = preg_replace('/<\/(tr|li)[^>]*>/i', "\n", $string);
$string = preg_replace('/<\/(td|th)[^>]*>/i', "\t", $string);
$string = strip_tags($string);
// Line endings unification and cleaning.
$string = str_replace(["\r\n", "\n\r", "\r"], "\n", $string);
$string = preg_replace('/\s*\n/', "\n", $string);
$string = preg_replace('/\n+/', "\n", $string);
return trim($string);
}
/**
* Detects encoding of html-formatted text.
*
* @param string $string the input html-formatted text
*
* @return string returns the detected encoding
*/
function api_detect_encoding_html($string)
{
if (@preg_match('/<head.*(<meta[^>]*content=[^>]*>).*<\/head>/si', $string, $matches)) {
if (@preg_match('/<meta[^>]*charset=(.*)["\';][^>]*>/si', $matches[1], $matches)) {
return api_refine_encoding_id(trim($matches[1]));
}
}
return api_detect_encoding(api_html_to_text($string));
}
/**
* Converts the text of a html-document to a given encoding, the meta-tag is changed accordingly.
*
* @param string $string the input full-html document
* @param string the new encoding value to be set
*/
function api_set_encoding_html(&$string, $encoding)
{
$old_encoding = api_detect_encoding_html($string);
if (@preg_match('/(.*<head.*)(<meta[^>]*content=[^>]*>)(.*<\/head>.*)/si', $string, $matches)) {
$meta = $matches[2];
if (@preg_match("/(<meta[^>]*charset=)(.*)([\"';][^>]*>)/si", $meta, $matches1)) {
$meta = $matches1[1].$encoding.$matches1[3];
$string = $matches[1].$meta.$matches[3];
} else {
$string = $matches[1].'<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/>'.$matches[3];
}
} else {
$count = 1;
if (false !== strpos('</head>', strtolower($string))) {
$string = str_ireplace(
'</head>',
'<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/></head>',
$string,
$count
);
} else {
$string = str_ireplace(
'<body>',
'<head><meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/></head><body>',
$string,
$count
);
}
}
$string = api_convert_encoding($string, $encoding, $old_encoding);
}
/**
* Returns the title of a html document.
*
* @param string $string the contents of the input document
* @param string $output_encoding The encoding of the retrieved title.
* If the value is not set, the system encoding is assumed.
* @param string $input_encoding The encoding of the input document. If the value is not set, it is detected.
*
* @return string the retrieved title, html-entities and extra-whitespace between the words are cleaned
*/
function api_get_title_html(&$string, $output_encoding = null, $input_encoding = null)
{
if (@preg_match('/<head.+<title[^>]*>(.*)<\/title>/msi', $string, $matches)) {
if (empty($output_encoding)) {
$output_encoding = api_get_system_encoding();
}
if (empty($input_encoding)) {
$input_encoding = api_detect_encoding_html($string);
}
return trim(
@preg_replace(
'/\s+/',
' ',
api_html_entity_decode(
api_convert_encoding($matches[1], $output_encoding, $input_encoding),
ENT_QUOTES,
$output_encoding
)
)
);
}
return '';
}
/**
* Detects encoding of xml-formatted text.
*
* @param string $string the input xml-formatted text
* @param string $default_encoding This is the default encoding to be returned
* if there is no way the xml-text's encoding to be detected.
* If it not spesified, the system encoding is assumed then.
*
* @return string returns the detected encoding
*
* @todo The second parameter is to be eliminated. See api_detect_encoding_html().
*/
function api_detect_encoding_xml($string, $default_encoding = null)
{
if (preg_match(_PCRE_XML_ENCODING, $string, $matches)) {
return api_refine_encoding_id($matches[1]);
}
if (api_is_valid_utf8($string)) {
return 'UTF-8';
}
if (empty($default_encoding)) {
$default_encoding = _api_mb_internal_encoding();
}
return api_refine_encoding_id($default_encoding);
}
/**
* Converts character encoding of a xml-formatted text.
* If inside the text the encoding is declared, it is modified accordingly.
*
* @param string $string the text being converted
* @param string $to_encoding the encoding that text is being converted to
* @param string $from_encoding (optional) The encoding that text is being converted from.
* If it is omited, it is tried to be detected then.
*
* @return string returns the converted xml-text
*/
function api_convert_encoding_xml($string, $to_encoding, $from_encoding = null)
{
return _api_convert_encoding_xml($string, $to_encoding, $from_encoding);
}
/**
* Converts character encoding of a xml-formatted text into UTF-8.
* If inside the text the encoding is declared, it is set to UTF-8.
*
* @param string $string the text being converted
* @param string $from_encoding (optional) The encoding that text is being converted from.
* If it is omited, it is tried to be detected then.
*
* @return string returns the converted xml-text
*/
function api_utf8_encode_xml($string, $from_encoding = null)
{
return _api_convert_encoding_xml($string, 'UTF-8', $from_encoding);
}
/**
* Converts character encoding of a xml-formatted text from UTF-8 into a specified encoding.
* If inside the text the encoding is declared, it is modified accordingly.
*
* @param string $string the text being converted
* @param string $to_encoding (optional) The encoding that text is being converted to.
* If it is omitted, the platform character set is assumed.
*
* @return string returns the converted xml-text
*/
function api_utf8_decode_xml($string, $to_encoding = 'UTF-8')
{
return _api_convert_encoding_xml($string, $to_encoding, 'UTF-8');
}
/**
* Converts character encoding of a xml-formatted text.
* If inside the text the encoding is declared, it is modified accordingly.
*
* @param string $string the text being converted
* @param string $to_encoding the encoding that text is being converted to
* @param string $from_encoding (optional) The encoding that text is being converted from.
* If the value is empty, it is tried to be detected then.
*
* @return string returns the converted xml-text
*/
function _api_convert_encoding_xml(&$string, $to_encoding, $from_encoding)
{
if (empty($from_encoding)) {
$from_encoding = api_detect_encoding_xml($string);
}
$to_encoding = api_refine_encoding_id($to_encoding);
if (!preg_match('/<\?xml.*\?>/m', $string, $matches)) {
return api_convert_encoding(
'<?xml version="1.0" encoding="'.$to_encoding.'"?>'."\n".$string,
$to_encoding,
$from_encoding
);
}
if (!preg_match(_PCRE_XML_ENCODING, $string)) {
if (false !== strpos($matches[0], 'standalone')) {
// The encoding option should precede the standalone option,
// othewise DOMDocument fails to load the document.
$replace = str_replace('standalone', ' encoding="'.$to_encoding.'" standalone', $matches[0]);
} else {
$replace = str_replace('?>', ' encoding="'.$to_encoding.'"?>', $matches[0]);
}
return api_convert_encoding(str_replace($matches[0], $replace, $string), $to_encoding, $from_encoding);
}
global $_api_encoding;
$_api_encoding = api_refine_encoding_id($to_encoding);
return api_convert_encoding(
preg_replace_callback(
_PCRE_XML_ENCODING,
'_api_convert_encoding_xml_callback',
$string
),
$to_encoding,
$from_encoding
);
}
/**
* A callback for serving the function _api_convert_encoding_xml().
*
* @param array $matches input array of matches corresponding to the xml-declaration
*
* @return string returns the xml-declaration with modified encoding
*/
function _api_convert_encoding_xml_callback($matches)
{
global $_api_encoding;
return str_replace($matches[1], $_api_encoding, $matches[0]);
}
/* Functions for supporting ASCIIMathML mathematical formulas and ASCIIsvg maathematical graphics */
/**
* Dectects ASCIIMathML formula presence within a given html text.
*
* @param string $html the input html text
*
* @return bool returns TRUE when there is a formula found or FALSE otherwise
*/
function api_contains_asciimathml($html)
{
if (!preg_match_all('/<span[^>]*class\s*=\s*[\'"](.*?)[\'"][^>]*>/mi', $html, $matches)) {
return false;
}
foreach ($matches[1] as $string) {
$string = ' '.str_replace(',', ' ', $string).' ';
if (preg_match('/\sAM\s/m', $string)) {
return true;
}
}
return false;
}
/**
* Dectects ASCIIsvg graphics presence within a given html text.
*
* @param string $html the input html text
*
* @return bool returns TRUE when there is a graph found or FALSE otherwise
*/
function api_contains_asciisvg($html)
{
if (!preg_match_all('/<embed([^>]*?)>/mi', $html, $matches)) {
return false;
}
foreach ($matches[1] as $string) {
$string = ' '.str_replace(',', ' ', $string).' ';
if (preg_match('/sscr\s*=\s*[\'"](.*?)[\'"]/m', $string)) {
return true;
}
}
return false;
}
/**
* Convers a string from camel case into underscore.
* Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
*
* @param string $string The input string (ASCII)
*
* @return string The converted result string
*/
function api_camel_case_to_underscore($string)
{
return strtolower(preg_replace('/([a-z])([A-Z])/', "$1_$2", $string));
}
/**
* Converts a string with underscores into camel case.
* Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
*
* @param string $string The input string (ASCII)
* @param bool $capitalise_first_char (optional)
* If true (default), the function capitalises the first char in the result string
*
* @return string The converted result string
*/
function api_underscore_to_camel_case($string, $capitalise_first_char = true)
{
if ($capitalise_first_char) {
$string = ucfirst($string);
}
return preg_replace_callback('/_([a-z])/', '_api_camelize', $string);
}
// A function for internal use, only for this library.
function _api_camelize($match)
{
return strtoupper($match[1]);
}
/**
* Truncates a string.
*
* @author Brouckaert Olivier
*
* @param string $text the text to truncate
* @param int $length The approximate desired length. The length of the suffix below is to be added to
* have the total length of the result string.
* @param string $suffix a suffix to be added as a replacement
* @param string $encoding (optional) The encoding to be used. If it is omitted,
* the platform character set will be used by default.
* @param bool $middle if this parameter is true, truncation is done in the middle of the string
*
* @return string truncated string, decorated with the given suffix (replacement)
*/
function api_trunc_str($text, $length = 30, $suffix = '...', $middle = false, $encoding = null)
{
if (empty($encoding)) {
$encoding = api_get_system_encoding();
}
$text_length = api_strlen($text, $encoding);
if ($text_length <= $length) {
return $text;
}
if ($middle) {
return rtrim(
api_substr(
$text,
0,
round($length / 2),
$encoding
)
).
$suffix.
ltrim(
api_substr(
$text,
-round($length / 2),
$text_length,
$encoding
)
);
}
return rtrim(api_substr($text, 0, $length, $encoding)).$suffix;
}
/**
* Replace tags with a space in a text.
* If $in_double_quote_replace, replace " with '' (for HTML attribute purpose, for exemple).
*
* @return string
*
* @author hubert borderiou
*/
function api_remove_tags_with_space($in_html, $in_double_quote_replace = true)
{
$out_res = $in_html;
if ($in_double_quote_replace) {
$out_res = str_replace('"', "''", $out_res);
}
// avoid text stuck together when tags are removed, adding a space after >
$out_res = str_replace(">", "> ", $out_res);
$out_res = strip_tags($out_res);
return $out_res;
}
/**
* @author Rewritten by Nathan Codding - Feb 6, 2001.
* completed by Hugues Peeters - July 22, 2002
*
* Actually this function is taken from the PHP BB 1.4 script
* - Goes through the given string, and replaces xxxx://yyyy with an HTML <a> tag linking
* to that URL
* - Goes through the given string, and replaces www.xxxx.yyyy[zzzz] with an HTML <a> tag linking
* to http://www.xxxx.yyyy[/zzzz]
* - Goes through the given string, and replaces xxxx@yyyy with an HTML mailto: tag linking
* to that email address
* - Only matches these 2 patterns either after a space, or at the beginning of a line
*
* Notes: the email one might get annoying - it's easy to make it more restrictive, though.. maybe
* have it require something like xxxx@yyyy.zzzz or such. We'll see.
*/
/**
* Callback to convert URI match to HTML A element.
*
* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link * make_clickable()}.
*
* @since Wordpress 2.3.2
*
* @param array $matches single Regex Match
*
* @return string HTML A element with URI address
*/
function _make_url_clickable_cb($matches)
{
$url = $matches[2];
if (')' == $matches[3] && strpos($url, '(')) {
// If the trailing character is a closing parethesis, and the URL has an opening
// parenthesis in it, add the closing parenthesis to the URL.
// Then we can let the parenthesis balancer do its thing below.
$url .= $matches[3];
$suffix = '';
} else {
$suffix = $matches[3];
}
// Include parentheses in the URL only if paired
while (substr_count($url, '(') < substr_count($url, ')')) {
$suffix = strrchr($url, ')').$suffix;
$url = substr($url, 0, strrpos($url, ')'));
}
$url = esc_url($url);
if (empty($url)) {
return $matches[0];
}
return $matches[1]."<a href=\"$url\" rel=\"nofollow\">$url</a>".$suffix;
}
/**
* Checks and cleans a URL.
*
* A number of characters are removed from the URL. If the URL is for displaying
* (the default behaviour) ampersands are also replaced. The 'clean_url' filter
* is applied to the returned cleaned URL.
*
* @since wordpress 2.8.0
*
* @uses \wp_kses_bad_protocol() To only permit protocols in the URL set
* via $protocols or the common ones set in the function.
*
* @param string $url the URL to be cleaned
* @param array $protocols Optional. An array of acceptable protocols.
* Defaults to 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher',
* 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' if not set.
* @param string $_context Private. Use esc_url_raw() for database usage.
*
* @return string the cleaned $url after the 'clean_url' filter is applied
*/
function esc_url($url, $protocols = null, $_context = 'display')
{
//$original_url = $url;
if ('' == $url) {
return $url;
}
$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
$strip = ['%0d', '%0a', '%0D', '%0A'];
$url = _deep_replace($strip, $url);
$url = str_replace(';//', '://', $url);
/* If the URL doesn't appear to contain a scheme, we
* presume it needs http:// appended (unless a relative
* link starting with /, # or ? or a php file).
*/
if (false === strpos($url, ':') && !in_array($url[0], ['/', '#', '?']) &&
!preg_match('/^[a-z0-9-]+?\.php/i', $url)) {
$url = 'http://'.$url;
}
return Security::remove_XSS($url);
}
/**
* Perform a deep string replace operation to ensure the values in $search are no longer present.
*
* Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
* e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
* str_replace would return
*
* @since wordpress 2.8.1
*
* @param string|array $search The value being searched for, otherwise known as the needle.
* An array may be used to designate multiple needles.
* @param string $subject the string being searched and replaced on, otherwise known as the haystack
*
* @return string the string with the replaced svalues
*/
function _deep_replace($search, $subject)
{
$subject = (string) $subject;
$count = 1;
while ($count) {
$subject = str_replace($search, '', $subject, $count);
}
return $subject;
}
/**
* Callback to convert URL match to HTML A element.
*
* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link * make_clickable()}.
*
* @since wordpress 2.3.2
*
* @param array $matches single Regex Match
*
* @return string HTML A element with URL address
*/
function _make_web_ftp_clickable_cb($matches)
{
$ret = '';
$dest = $matches[2];
$dest = 'http://'.$dest;
$dest = esc_url($dest);
if (empty($dest)) {
return $matches[0];
}
// removed trailing [.,;:)] from URL
if (true === in_array(substr($dest, -1), ['.', ',', ';', ':', ')'])) {
$ret = substr($dest, -1);
$dest = substr($dest, 0, strlen($dest) - 1);
}
return $matches[1]."<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";
}
/**
* This functions cuts a paragraph
* i.e cut('Merry Xmas from Lima',13) = "Merry Xmas fr...".
*
* @param string The text to "cut"
* @param int Count of chars
* @param bool Whether to embed in a <span title="...">...</span>
* */
function cut($text, $maxchar, $embed = false): string
{
if (api_strlen($text) > $maxchar) {
if ($embed) {
return '<p title="'.$text.'">'.api_substr($text, 0, $maxchar).'...</p>';
}
return api_substr($text, 0, $maxchar).' ...';
}
return $text;
}
/**
* Show a number as only integers if no decimals, but will show 2 decimals if exist.
*
* @param mixed Number to convert
* @param int Decimal points 0=never, 1=if needed, 2=always
* @param string $decimalPoint
* @param string $thousandsSeparator
*
* @return mixed An integer or a float depends on the parameter
*/
function float_format($number, $flag = 1, $decimalPoint = '.', $thousandsSeparator = ',')
{
$flag = (int) $flag;
if (is_numeric($number)) {
if (!$number) {
$result = (2 == $flag ? '0.'.str_repeat('0', EXERCISE_NUMBER_OF_DECIMALS) : '0');
} else {
if (floor($number) == $number) {
$result = number_format(
$number,
(2 == $flag ? EXERCISE_NUMBER_OF_DECIMALS : 0),
$decimalPoint,
$thousandsSeparator
);
} else {
$result = number_format(
round($number, 2),
(0 == $flag ? 0 : EXERCISE_NUMBER_OF_DECIMALS),
$decimalPoint,
$thousandsSeparator
);
}
}
return $result;
}
}
// TODO: To be checked for correct timezone management.
/**
* Function to obtain last week timestamps.
*
* @return array Times for every day inside week
*/
function get_last_week()
{
$week = date('W');
$year = date('Y');
$lastweek = $week - 1;
if (0 == $lastweek) {
$week = 52;
$year--;
}
$lastweek = sprintf("%02d", $lastweek);
$arrdays = [];
for ($i = 1; $i <= 7; $i++) {
$arrdays[] = strtotime("$year"."W$lastweek"."$i");
}
return $arrdays;
}
/**
* Gets the week from a day.
*
* @param string Date in UTC (2010-01-01 12:12:12)
*
* @return int Returns an integer with the week number of the year
*/
function get_week_from_day($date)
{
if (!empty($date)) {
$time = api_strtotime($date, 'UTC');
return date('W', $time);
}
return date('W');
}
/**
* This function splits the string into words and then joins them back together again one by one.
* Example: "Test example of a long string"
* substrwords(5) = Test ... *.
*
* @param $text string
* @param $maxchar int the max number of character
* @param $end string how the string will be ended
*
* @return string
*/
function substrwords(string $text, int $maxchar, string $end = '...'): string
{
if (strlen($text) > $maxchar) {
$words = explode(" ", $text);
$output = '';
$i = 0;
while (1) {
$length = (strlen($output) + strlen($words[$i]));
if ($length > $maxchar) {
break;
} else {
$output = $output." ".$words[$i];
$i++;
}
}
} else {
$output = $text;
return $output;
}
return $output.$end;
}
function implode_with_key($glue, $array)
{
if (!empty($array)) {
$string = '';
foreach ($array as $key => $value) {
if (empty($value)) {
$value = 'null';
}
$string .= $key." : ".$value." $glue ";
}
return $string;
}
return '';
}
/**
* Transform the file size in a human readable format.
*
* @param int $file_size Size of the file in bytes
*
* @return string A human readable representation of the file size
*/
function format_file_size($file_size)
{
$file_size = (int) $file_size;
if ($file_size >= 1073741824) {
$file_size = (round($file_size / 1073741824 * 100) / 100).'G';
} elseif ($file_size >= 1048576) {
$file_size = (round($file_size / 1048576 * 100) / 100).'M';
} elseif ($file_size >= 1024) {
$file_size = (round($file_size / 1024 * 100) / 100).'k';
} else {
$file_size = $file_size.'B';
}
return $file_size;
}
/**
* Converts an string CLEANYO[admin][amann,acostea]
* into an array:.
*
* array(
* CLEANYO
* admin
* amann,acostea
* )
*
* @param $array
*
* @return array
*/
function bracketsToArray($array)
{
return preg_split('/[\[\]]+/', $array, -1, PREG_SPLIT_NO_EMPTY);
}
/**
* @param string $string
* @param bool $capitalizeFirstCharacter
*
* @return mixed
*/
function underScoreToCamelCase($string, $capitalizeFirstCharacter = true)
{
$str = str_replace(' ', '', ucwords(str_replace('_', ' ', $string)));
if (!$capitalizeFirstCharacter) {
$str[0] = strtolower($str[0]);
}
return $str;
}
/**
* @param string $value
*/
function trim_value(&$value)
{
$value = trim($value);
}
/**
* Strips only the given tags in the given HTML string.
*
* @param string $html
* @param array $tags
*
* @return string
*/
function strip_tags_blacklist($html, $tags)
{
foreach ($tags as $tag) {
$regex = '#<\s*'.$tag.'[^>]*>.*?<\s*/\s*'.$tag.'>#msi';
$html = preg_replace($regex, '', $html);
}
return $html;
}
/**
* Remove tags from HTML anf return the $in_number_char first non-HTML char
* Postfix the text with "..." if it has been truncated.
*
* @param string $text
* @param int $number
*
* @return string
*
* @author hubert borderiou
*/
function api_get_short_text_from_html($text, $number)
{
// Delete script and style tags
$text = preg_replace('/(<(script|style)\b[^>]*>).*?(<\/\2>)/is', "$1$3", $text);
$text = api_html_entity_decode($text);
$out_res = api_remove_tags_with_space($text, false);
$postfix = "...";
if (strlen($out_res) > $number) {
$out_res = substr($out_res, 0, $number).$postfix;
}
return $out_res;
}
/**
* Filter a multi-language HTML string (for the multi-language HTML
* feature) into the given language (strip the rest).
*
* @param string $htmlString The HTML string to "translate".
* Usually <p><span lang="en">Some string</span></p><p><span lang="fr">Une chaîne</span></p>
* @param string $language The language in which we want to get the
*
* @return string The filtered string in the given language, or the full string if no translated string was identified
*
*@throws Exception
*/
function api_get_filtered_multilingual_HTML_string($htmlString, $language = null)
{
if ('false' === api_get_setting('editor.translate_html')) {
return $htmlString;
}
$userInfo = api_get_user_info();
$languageId = 0;
if (!empty($language)) {
$languageId = api_get_language_id($language);
} elseif (!empty($userInfo['language'])) {
$languageId = api_get_language_id($userInfo['language']);
}
$languageInfo = api_get_language_info($languageId);
$isoCode = 'en';
if (!empty($languageInfo)) {
$isoCode = $languageInfo['isocode'];
}
// Split HTML in the separate language strings
// Note: some strings might look like <p><span ..>...</span></p> but others might be like combine 2 <span> in 1 <p>
if (!preg_match('/<span.*?lang="(\w\w)">/is', $htmlString)) {
return $htmlString;
}
$matches = [];
preg_match_all('/<span.*?lang="(\w\w)">(.*?)<\/span>/is', $htmlString, $matches);
if (!empty($matches)) {
// matches[0] are the full string
// matches[1] are the languages
// matches[2] are the strings
foreach ($matches[1] as $id => $match) {
if ($match == $isoCode) {
return $matches[2][$id];
}
}
// Could find the pattern but could not find our language. Return the first language found.
return $matches[2][0];
}
// Could not find pattern. Just return the whole string. We shouldn't get here.
return $htmlString;
}