If you need to split a string after every 5 characters, try str_split()
:
$output = str_split($string, 5);
If you only need to extract the first 5 characters and put the rest of the string in the second part of your array, you can use substr()
as NullUserException suggests (code from his now-deleted answer):
$output[0] = substr($string, 0, 5);
$output[1] = substr($string, 5);
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