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<?php function f($a = null, $b) { var_dump(['a' => $a, 'b' => $b]); } f('1', 'test');
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Optional parameter $a declared before required parameter $b is implicitly treated as a required parameter in /in/A4iS6 on line 3 array(2) { ["a"]=> string(1) "1" ["b"]=> string(4) "test" }

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