PHP substr_count for arrays (needle array)

substr_count_for_arrays.php

<?php
function substr_count_array($haystack, $needle) {
    $count = 0;
    $haystack = strtolower($haystack);
    foreach ($needle as $substring) {
        $count += substr_count($haystack, strtolower($substring));
    }
    return $count;
}
?>