Truncate Text Preserving HTML Tags With PHP

Truncate/limit text preserving the HTML tags (the code auto-closes the tags).


Example


echo String::truncate('jonas', 3, '...'); //jo<...
echo String::truncate('jonas', 3, '...', true); //jon...
echo String::truncate('jonas', 3, '...', true, false); //jon...



Code


//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com

class String{
	public static function truncate($s, $l, $e = '...', $isHTML = false){
		$i = 0;
		$tags = array();
		if($isHTML){
			preg_match_all('/<[^>]+>([^<]*)/', $s, $m, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
			foreach($m as $o){
				if($o[0][1] - $i >= $l)
					break;
				$t = substr(strtok($o[0][0], " \t\n\r\0\x0B>"), 1);
				if($t[0] != '/')
					$tags[] = $t;
				elseif(end($tags) == substr($t, 1))
					array_pop($tags);
				$i += $o[1][1] - $o[0][1];
			}
		}
		return substr($s, 0, $l = min(strlen($s),  $l + $i)) . (count($tags = array_reverse($tags)) ? '' : '') . (strlen($s) > $l ? $e : '');
	}
}