3v4l.org

run code in 300+ PHP versions simultaneously
<?php $o1 = (object) array('a' => 1); $h1 = spl_object_hash($o1); unset($o1); $o2 = (object) array('b' => 1); $h2 = spl_object_hash($o2); echo "$h1\n$h2";
Output for git.master, git.master_jit, rfc.property-hooks
00000000000000010000000000000000 00000000000000010000000000000000

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