Extract string from markup

stringExtract.php

function tagExtractString($string, $start, $end) {
    $string = " ".$string;
    $init = strpos($string, $start);
    if ($ini == 0) return "";
    $init += strlen($start);
    $len = strpos($string, $end, $init) - $init;
    return substr($string, $init, $len);
}