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<?php function foo($a = "", $b = NULL, $c = 200, $d = NULL) { var_dump([$a, $b, $c, $d]); } foo();
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(0) "" [1]=> NULL [2]=> int(200) [3]=> NULL }

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