S::split should work with empty delimiter, resulting in splitting string to array of chars

[meszaros-lajos-gyorgy]

explode() does not permit having an empty delimiter

[meszaros-lajos-gyorgy]

<?php
function splitToChars($str){
	$chars = [];
	for ($i = 0; $i < strlen($str); $i++) {
		$chars[] = $str[$i];
	}
	return $chars;
}

This is not multibyte string safe, but a good base point