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<?php class A { private $foo = ["a" => [1, 2, 3]]; function __get($a) { if (isset($this->foo[$a])) { return $this->foo[$a]; } throw new Exception("Invalid key accessed! Check with isset() first!"); } function __isset($a) { return isset($this->foo[$a]); } } $obj = new A; var_dump(isset($obj->a[1])); var_dump(isset($obj->b[1]));
Output for 7.0.6 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.27, 7.4.0 - 7.4.15, 8.0.0 - 8.0.3
bool(true) bool(false)
Output for 7.0.0 - 7.0.5
bool(true) Fatal error: Uncaught Exception: Invalid key accessed! Check with isset() first! in /in/r8U7T:10 Stack trace: #0 /in/r8U7T(20): A->__get('b') #1 {main} thrown in /in/r8U7T on line 10
Process exited with code 255.
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28
bool(true) Fatal error: Uncaught exception 'Exception' with message 'Invalid key accessed! Check with isset() first!' in /in/r8U7T:10 Stack trace: #0 /in/r8U7T(20): A->__get('b') #1 {main} thrown in /in/r8U7T on line 10
Process exited with code 255.