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<?php $a = ['a', 'b']; var_dump(count($a['c'])); var_dump(empty($a['c'])); var_dump(isset($a['c']));
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "c" in /in/6lKFn on line 4 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /in/6lKFn:4 Stack trace: #0 {main} thrown in /in/6lKFn on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.9
Warning: Undefined array key "c" in /in/6lKFn on line 4 Fatal error: Uncaught TypeError: count(): Argument #1 ($var) must be of type Countable|array, null given in /in/6lKFn:4 Stack trace: #0 {main} thrown in /in/6lKFn on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: c in /in/6lKFn on line 4 Warning: count(): Parameter must be an array or an object that implements Countable in /in/6lKFn on line 4 int(0) bool(true) bool(false)
Output for 7.3.32 - 7.3.33, 7.4.26
Warning: count(): Parameter must be an array or an object that implements Countable in /in/6lKFn on line 4 int(0) bool(true) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Undefined index: c in /in/6lKFn on line 4 int(0) bool(true) bool(false)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6lKFn on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/6lKFn on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/6lKFn on line 3
Process exited with code 255.

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