Online PHP editor | output for 2IdLE

@ 2018-09-28T10:29:44Z

<?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);

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: bool(false) bool(false) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [4]=> string(1) "x" } bool(true) bool(true) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> string(1) "x" } bool(true) bool(true) array(4) { [4]=> int(0) [5]=> int(1) [6]=> int(2) [7]=> string(1) "x" } bool(true) bool(false) array(4) { [-6]=> int(0) [-5]=> int(-2) [-4]=> int(2) [-3]=> string(1) "x" }
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: bool(false) bool(false) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [4]=> string(1) "x" } bool(true) bool(true) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> string(1) "x" } bool(true) bool(true) array(4) { [4]=> int(0) [5]=> int(1) [6]=> int(2) [7]=> string(1) "x" } bool(false) bool(false) array(4) { [-6]=> int(0) [-5]=> int(-2) [-4]=> int(2) [0]=> string(1) "x" }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33: Fatal error: Uncaught Error: Call to undefined function array_key_last() in /in/2IdLE:5 Stack trace: #0 /in/2IdLE(12): isIndexNormalized(Array) #1 {main} thrown in /in/2IdLE on line 5
Process exited with code 255.
Output for 5.6.38: Fatal error: Call to undefined function array_key_last() in /in/2IdLE on line 5
Process exited with code 255.

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