$s = "php java python c c++ c#";
$arr = str_split($s);
print_r($arr);
/*
run:
Array
(
[0] => p
[1] => h
[2] => p
[3] =>
[4] => j
[5] => a
[6] => v
[7] => a
[8] =>
[9] => p
[10] => y
[11] => t
[12] => h
[13] => o
[14] => n
[15] =>
[16] => c
[17] =>
[18] => c
[19] => +
[20] => +
[21] =>
[22] => c
[23] => #
)
*/