PHP startsWith, endsWith

function startsWith($haystack, $needle) {

    // search backwards starting from haystack length characters from the end

    return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== false;

}

function endsWith($haystack, $needle) {

    // search forward starting from end minus needle length characters

    return $needle === "" || (($temp = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $temp) !== false);

}

출처: http://jhrun.tistory.com/179