<?php
$items = array('a', 'b', 'z');
function render_array_as_serial_comma($items) {
$final_string = implode(', ', $items) . ' and ' . $final_string; }
return $final_string;
}
echo render_array_as_serial_comma($items);
PD9waHAKJGl0ZW1zID0gYXJyYXkoJ2EnLCAnYicsICd6Jyk7CgpmdW5jdGlvbiByZW5kZXJfYXJyYXlfYXNfc2VyaWFsX2NvbW1hKCRpdGVtcykgewoJJGZpbmFsX3N0cmluZyA9IGFycmF5X3BvcCgkaXRlbXMpOwoJaWYoY291bnQoJGl0ZW1zKSA+PSAxKSB7CgkJJGZpbmFsX3N0cmluZyA9IGltcGxvZGUoJywgJywgJGl0ZW1zKSAuICcgYW5kICcgLiAkZmluYWxfc3RyaW5nOwoJfQoJcmV0dXJuICRmaW5hbF9zdHJpbmc7Cn0KCmVjaG8gcmVuZGVyX2FycmF5X2FzX3NlcmlhbF9jb21tYSgkaXRlbXMpOw==