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<?php function a($a, array $b = NULL) { foreach($b as $key => $value); } function b($a, array $b = array()) { foreach($b as $key => $value); } var_dump(a(1)); var_dump(b(1));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: foreach() argument must be of type array|object, null given in /in/rIB1G on line 6 NULL NULL

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