3v4l.org

run code in 300+ PHP versions simultaneously
<?php $strings = [ 'a', 'ab', 'abc' ]; var_export(preg_replace('/(.)(.*)(.)/', '$3$2$1', $strings));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 0 => 'a', 1 => 'ba', 2 => 'cba', )

preferences:
81.23 ms | 406 KiB | 5 Q