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uksort

PHP function Edit on GitHub ✎

(PHP 4, PHP 5, PHP 7, PHP 8)

Sort an array by keys using a user-defined comparison function

Description

uksort(array $array, callable $callback): true

Sorts array in place by keys using a user-supplied comparison function to determine the order.

Sort-unstable Reset-index

Parameters

array: The input array.
callback: Description

Return Values

Always

Changelog

Version	Description

Examples

uksort() example

php

<?php
function cmp($a, $b)
{
    $a = preg_replace('@^(a|an|the) @', '', $a);
    $b = preg_replace('@^(a|an|the) @', '', $b);
    return strcasecmp($a, $b);
}

$a = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);

uksort($a, "cmp");

foreach ($a as $key => $value) {
    echo "$key: $value\n";
}
?>

The above example will output:

output

an apple: 3
a banana: 4
the Earth: 2
John: 1