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<?php
// strip javascript, styles, html tags, normalize entities and spaces
// based on http://www.php.net/manual/en/function.strip-tags.php#68757
function html2text($html){
$text = $html;
'@<script.+?</script>@usi', // Strip out javascript content
'@<style.+?</style>@usi', // Strip style content
'@<!--.+?-->@us', // Strip multi-line comments including CDATA
'@</?[a-z].*?\>@usi', // Strip out HTML tags
);
// normalize common entities
$text = normalizeEntities($text);
// decode other entities
// normalize possibly repeated newlines, tabs, spaces to spaces
// we must still run htmlentities on anything that comes out!
// for instance:
// <<a>script>alert('XSS')//<<a>/script>
// will become
// <script>alert('XSS')//</script>
return $text;
}
// replace encoded and double encoded entities to equivalent unicode character
// also see /app/bookmarkletPopup.js
function normalizeEntities($text) {
// build $find and $replace from map one time
array('\'', 'apos', 39, 'x27'), // Apostrophe array('\'', '‘', 'lsquo', 8216, 'x2018'), // Open single quote array('\'', '’', 'rsquo', 8217, 'x2019'), // Close single quote array('"', '“', 'ldquo', 8220, 'x201C'), // Open double quotes array('"', 'â€', 'rdquo', 8221, 'x201D'), // Close double quotes array('\'', '‚', 'sbquo', 8218, 'x201A'), // Single low-9 quote array('"', '„', 'bdquo', 8222, 'x201E'), // Double low-9 quote array('\'', '′', 'prime', 8242, 'x2032'), // Prime/minutes/feet array('"', '″', 'Prime', 8243, 'x2033'), // Double prime/seconds/inches array(' ', 'nbsp', 160, 'xA0'), // Non-breaking space array('-', 'â€', 8208, 'x2010'), // Hyphen array('-', '–', 'ndash', 8211, 150, 'x2013'), // En dash array('--', '—', 'mdash', 8212, 151, 'x2014'), // Em dash array(' ', ' ', 'ensp', 8194, 'x2002'), // En space array(' ', ' ', 'emsp', 8195, 'x2003'), // Em space array(' ', ' ', 'thinsp', 8201, 'x2009'), // Thin space array('*', '•', 'bull', 8226, 'x2022'), // Bullet array('*', '‣', 8227, 'x2023'), // Triangular bullet array('...', '…', 'hellip', 8230, 'x2026'), // Horizontal ellipsis array('°', 'deg', 176, 'xB0'), // Degree array('€', 'euro', 8364, 'x20AC'), // Euro array('Â¥', 'yen', 165, 'xA5'), // Yen array('£', 'pound', 163, 'xA3'), // British Pound array('©', 'copy', 169, 'xA9'), // Copyright Sign array('®', 'reg', 174, 'xAE'), // Registered Sign array('â„¢', 'trade', 8482, 'x2122') // TM Sign );
foreach ($map as $e) {
for ($i = 1; $i < count($e); ++$i) { $code = $e[$i];
// numeric entity
$regex = "/&(amp;)?#0*$code;/";
}
elseif (preg_match('/^.$/u', $code)/* one unicode char*/) { // single character
$regex = "/$code/u";
}
elseif (preg_match('/^x([0-9A-F]{2}){1,2}$/i', $code)) { // hex entity
$regex = "/&(amp;)?#x0*" . substr($code, 1) . ";/i"; }
else {
// named entity
$regex = "/&(amp;)?$code;/";
}
$find[] = $regex;
$repl[] = $e[0];
}
}
} // end first time build
}