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<?php class Test { protected static $array = ['a', 'b', 'c']; protected static function getArray() { return $array; } public static function testMe($testArray) { return array_key_intersect($testArray, array_flip(self::getArray())); } } print_r(Test::testMe(['a' => 2]));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function array_key_intersect() in /in/MgTN0:10 Stack trace: #0 /in/MgTN0(14): Test::testMe(Array) #1 {main} thrown in /in/MgTN0 on line 10
Process exited with code 255.

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