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<?php function foo(array &$x = NULL){} $x = array(); foo($x[0]); foo($x[1]); foo($x[2]); foo($x[3]); var_dump($x);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> NULL [1]=> NULL [2]=> NULL [3]=> NULL }

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