3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = "0wz"; $foo++; var_dump($foo, hexdec($foo)); $foo++; var_dump($foo); echo "PHP goes to $foo";
Output for 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
string(3) "0xa" int(10) string(3) "0xb" PHP goes to 0xb
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
string(3) "0xa" int(10) int(11) PHP goes to 11
preferences:
269.6 ms | 404 KiB | 460 Q