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<?php function mutabledefault($arg=array("xyz")) { var_dump($arg); $arg["foo"] = "new"; var_dump($arg); } mutabledefault(); mutabledefault();
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(3) "xyz" } array(2) { [0]=> string(3) "xyz" ["foo"]=> string(3) "new" } array(1) { [0]=> string(3) "xyz" } array(2) { [0]=> string(3) "xyz" ["foo"]=> string(3) "new" }

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