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<?php $x = 0; $a = array(&$x); $c =& $a; $b = $a; $x = 2; unset($x); $b[1]++; $b[0]++; echo $a[0], ' ', $b[0];
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 1 in /in/bBl8k on line 8 2 3

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