PHP 8 reference · Array Sorting Functions

PHP natcasesort() Function

Sort an array in natural order while ignoring case, keeping keys. "Item2" comes before "item10".

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Syntax

natcasesort(array &$array): true

Parameter	Description
`array`	The array to sort (changed in place).

Always true.

Natural, case-insensitiveTry it yourself

<?php
$names = ["Item10", "item2", "ITEM1"];
natcasesort($names);
echo implode(", ", $names), "\n";

Output

ITEM1, item2, Item10

Compared with natsort()Try it yourself

<?php
$list = ["b2", "A10", "a2"];
natsort($list);
echo implode(", ", $list), "\n";
natcasesort($list);
echo implode(", ", $list), "\n";

Output

A10, a2, b2
a2, A10, b2

Version	Change
PHP 4.0	Added
PHP 8.0	Sorting is stable: elements that compare equal keep their original order.
PHP 8.2	The return type is `true` (it was `bool`).

natsort() · Sort an array in natural order, so "img2" comes before "img10", keeping keys. Case-sensitive.
strnatcasecmp() · Compare strings in natural order ("a2" before "a10") while ignoring upper and lower case.
PHP Arrays · tutorial
PHP Array Functions · tutorial