Functions startsWith() and endsWith() like in Python

starts_with_ends_with.php

<?php

function startsWith($haystack, $needle) {
    return !strncmp($haystack, $needle, strlen($needle));
}

function endsWith($haystack, $needle) {
    $length = strlen($needle);
    if ($length == 0) {
        return true;
    }

    return (substr($haystack, -$length) === $needle);
}