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<?php $x = 0; $a = array(&$x); $b = $a; $x = 2; unset($x); $b[1]++; $b[0]++; echo $a[0], ' ', $b[1];
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 1 in /in/YVPRs on line 8 2 1

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