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<?php // string, null, bool, float, largest specified previous index function isIndexedArray($array) { return !(bool)count(array_filter(array_keys($array), 'is_string')); } assert(isIndexedArray(NULL));
Output for 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 TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /in/tWhsR:5 Stack trace: #0 /in/tWhsR(5): array_keys(NULL) #1 /in/tWhsR(8): isIndexedArray(NULL) #2 {main} thrown in /in/tWhsR on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: array_keys() expects parameter 1 to be array, null given in /in/tWhsR on line 5 Warning: array_filter() expects parameter 1 to be array, null given in /in/tWhsR on line 5 Warning: count(): Parameter must be an array or an object that implements Countable in /in/tWhsR on line 5
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Warning: array_keys() expects parameter 1 to be array, null given in /in/tWhsR on line 5 Warning: array_filter() expects parameter 1 to be array, null given in /in/tWhsR on line 5

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