3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'lognstring'; $segmentLength = 3; $totalLength = strlen($string); for ($i = 0; $i < $totalLength; $i += $segmentLength) { $result[] = substr( $string, $i > $totalLength - $segmentLength ? $totalLength - $segmentLength : $i, $segmentLength ); } var_export($result);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array ( 0 => 'log', 1 => 'nst', 2 => 'rin', 3 => 'ing', )

preferences:
101.37 ms | 406 KiB | 5 Q