3v4l.org

run code in 300+ PHP versions simultaneously
<?php $phone = '0312345678'; $phone = '09012345678'; echo strlen($phone), "\n"; $return[] = substr($phone, -4); $return[] = substr($phone, -4, 8); echo $phone, "\n"; var_dump($return);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
11 09012345678 array(2) { [0]=> string(4) "5678" [1]=> string(4) "5678" }
preferences:
242.67 ms | 404 KiB | 327 Q