split string?

Question

PHP

Good afternoon. Please help with one problem
$string = "J2123409871111222";
how to divide it into 4 parts
J 2123 4098 7111 1222

Answer 1

https://ideone.com/Hay4Pa

Answer 2

$parts[0] = substr($string, 0, 1);
$parts[1] = substr($string, 1, 4);
$parts[2] = substr($string, 5, 4);
$parts[3] = substr($string, 9, 4);
$parts[4] = substr($string, 13);