Online PHP editor | refs for 2IdLE

<?php function isIndexNormalized($array){ $array[] = 'aux'; return (array_key_last($array) - array_key_first($array) + 1) === count($array); } // ------- $array = [0, 1, 2, 3]; unset($array[3]); var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([0, 1, 2, "x"] === $array, $array); echo "\n\n\n\n"; // ------- $array = [0, 1, 2]; var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([0, 1, 2, "x"] === $array, $array); echo "\n\n\n\n"; // ------- $array = [4 => 0, 5 => 1, 6 => 2]; var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([4 => 0, 5 => 1, 6 => 2, 7 => "x"] === $array, $array); echo "\n\n\n\n"; // ------- //This one fails though, but it will work on PHP8 :P $array = [-6 => 0, -5 => -2, -4 => 2]; var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([-6 => 0, -5 => 1, -4 => 2, -3 => "x"] === $array, $array);