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<?php $a = array(); var_dump(isset($a['foo']['bar']['baz'])); var_dump(array_key_exists('baz', $a['foo']['bar']));
Output for 8.3.0 - 8.3.4
bool(false) Warning: Undefined array key "foo" in /in/AqeMh on line 6 Warning: Trying to access array offset on null in /in/AqeMh on line 6 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /in/AqeMh:6 Stack trace: #0 {main} thrown in /in/AqeMh on line 6
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
bool(false) Warning: Undefined array key "foo" in /in/AqeMh on line 6 Warning: Trying to access array offset on value of type null in /in/AqeMh on line 6 Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /in/AqeMh:6 Stack trace: #0 {main} thrown in /in/AqeMh on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.33
bool(false) Notice: Undefined index: foo in /in/AqeMh on line 6 Notice: Trying to access array offset on value of type null in /in/AqeMh on line 6 Warning: array_key_exists() expects parameter 2 to be array, null given in /in/AqeMh on line 6 NULL
Output for 7.3.32 - 7.3.33
bool(false) Warning: array_key_exists() expects parameter 2 to be array, null given in /in/AqeMh on line 6 NULL
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
bool(false) Notice: Undefined index: foo in /in/AqeMh on line 6 Warning: array_key_exists() expects parameter 2 to be array, null given in /in/AqeMh on line 6 NULL
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
bool(false) Notice: Undefined index: foo in /in/AqeMh on line 6 Warning: array_key_exists(): The second argument should be either an array or an object in /in/AqeMh on line 6 bool(false)
Output for 4.3.0 - 4.3.1
bool(false) Notice: Undefined index: foo in /in/AqeMh on line 6 Warning: array_key_exists() [http://www.php.net/function.array-key-exists]: The second argument should be either an array or an object in /in/AqeMh on line 6 bool(false)

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