Convert a string to an array
str_split ( string $string [, int $split_length = 1 ] ) : array
The input string.
Maximum length of the chunk.
If the optional split_length parameter is specified, the returned array will be broken down into chunks with each being split_length in length, otherwise each chunk will be one character in length. FALSE is returned if split_length is less than 1. If the split_length length exceeds the length of string, the entire string is returned as the first (and only) array element.
<? $string = "Hello"; $return = str_split($string); print_r($return); ?>
Array (  => H  => e  => l  => l  => o )
<? $string = "Hello"; $split_length = 2; $return = str_split($string, $split_length); print_r($return); ?>
Array (  => He  => ll  => o )