3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "A123456789123B"; var_export( preg_split('/(?:^.|...)\K/', $str) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => 'A', 1 => '123', 2 => '456', 3 => '789', 4 => '123', 5 => 'B', )
preferences:
150.07 ms | 406 KiB | 124 Q