Forum PHP 2017


(PHP 5 >= 5.2.0, PHP 7)

ArrayObject::uksortSort the entries by keys using a user-defined comparison function


public void ArrayObject::uksort ( callable $cmp_function )

This function sorts the keys of the entries using a user-supplied comparison function. The key to entry correlations will be maintained.



The callback comparison function.

Function cmp_function should accept two parameters which will be filled by pairs of entry keys. The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

Return Values

No value is returned.


Example #1 ArrayObject::uksort() example

function cmp($a$b) {
$a preg_replace('@^(a|an|the) @'''$a);
$b preg_replace('@^(a|an|the) @'''$b);

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

foreach (
$arrayObject as $key => $value) {

The above example will output:

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

See Also

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top