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<?php function func(&$c) { $r++; } $r = 1; func(func($r)) ; echo $r;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $r in /in/VUTrF on line 5 Notice: Only variables should be passed by reference in /in/VUTrF on line 8 Warning: Undefined variable $r in /in/VUTrF on line 5 1

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