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<?php function foo(&$x){ $x = null; } $a = 8; foo($a); var_dump($a,is_ref($a));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function is_ref() in /in/iIHCH:7 Stack trace: #0 {main} thrown in /in/iIHCH on line 7
Process exited with code 255.

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