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<?php function allowedArgs($input, $allowed) { return array_filter( $input, function ($key) use ($allowed) { return in_array($key, $allowed); }, ARRAY_FILTER_USE_KEY ); } function example($args) { extract(allowedArgs($args, ['foo', 'bar'])); var_dump($foo, $bar, $baz); } example(['bar' => 2, 'foo' => 1, 'baz'=> 3]);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $baz in /in/odZr7 on line 15 int(1) int(2) NULL

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