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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 git.master, git.master_jit
int(0)
Output for rfc.property-hooks
Warning: array_sum(): Addition is not supported on type string in /in/PHDg9 on line 4 int(0)

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