3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ['.1', '1.5', '0.10', '.8']; var_export(preg_replace('/^\.(?=\d)/', '0.', $array));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => '0.1', 1 => '1.5', 2 => '0.10', 3 => '0.8', )
preferences:
100.56 ms | 1249 KiB | 4 Q