3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array('vk_group' => NULL,'vk_group1' => 'http://vk.com/id43886762','vk_group2' => NULL); var_dump(array_sum($array));
Output for 8.3.0 - 8.3.6
Warning: array_sum(): Addition is not supported on type string in /in/PHDg9 on line 4 int(0)
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 - 5.6.28, 7.0.0 - 7.0.20, 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
int(0)

preferences:
238.61 ms | 406 KiB | 400 Q