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<?php $data = [ 'red', 'green', 'blue', ]; var_dump(array_is_list($data)); // true unset($data[1]); var_dump(array_is_list($data)); // false $data[] = 'yellow'; var_dump(array_is_list($data)); // false var_dump(array_keys($data)); // [0, 2, 3]
Output for 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
bool(true) bool(false) bool(false) array(3) { [0]=> int(0) [1]=> int(2) [2]=> int(3) }

preferences:
28.08 ms | 1152 KiB | 7 Q