<?php
$str = "Hey Arkadaş";
$arr1 = str_split($str);
$arr2 = str_split($str, 3);
print_r($arr1);
print_r($arr2);
?>
/*
Rasult:
Array
(
[0] => H
[1] => e
[2] => y
[3] =>
[4] => A
[5] => r
[6] => k
[7] => a
[8] => d
[9] => a
[10] => �
[11] => �
)
Array
(
[0] => Hey
[1] => Ar
[2] => kad
[3] => aş
)*/