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@ 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 git.master, git.master_jit, rfc.property-hooks: 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" }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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