(PHP 8 >= 8.1.0)
array_is_list — Checks whether a given array
is a list
Determines if the given array
is a list.
An array is considered a list if its keys consist of consecutive numbers
from 0
to count($array)-1
.
Example #1 array_is_list() example
<?php
var_dump(array_is_list([])); // true
var_dump(array_is_list(['apple', 2, 3])); // true
var_dump(array_is_list([0 => 'apple', 'orange'])); // true
// The array does not start at 0
var_dump(array_is_list([1 => 'apple', 'orange'])); // false
// The keys are not in the correct order
var_dump(array_is_list([1 => 'apple', 0 => 'orange'])); // false
// Non-integer keys
var_dump(array_is_list([0 => 'apple', 'foo' => 'bar'])); // false
// Non-consecutive keys
var_dump(array_is_list([0 => 'apple', 2 => 'bar'])); // false
?>
Note:
This function returns
true
on empty arrays.