str_split

array str_split(string $lancuch , [number $dlugosc] )

Converts $lancuch to an array, with each character becoming a separate element.

If the optional second argument $dlugosc is supplied, the array elements are chunks of $lancuch with a maximum length of $dlugosc characters. Returns false if $dlugosc is less than 1.

Example:

$lancuch = "test";
$tablica = str_split($lancuch);
print_r($tablica );

Result:

Array
(
[0] => t
[1] => e
[2] => s
[3] => t
)