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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 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
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.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Call to undefined function array_key_intersect() in /in/MgTN0 on line 10
Process exited with code 255.

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