ArrayObject::uasort
SplFileInfo
ArrayObject
PHP Manual

# ArrayObject::uksort

(PHP 5 >= 5.1.0)

ArrayObject::uksort — Sort the entries by keys using a user-defined comparison function

### 설명

void ArrayObject::uksort ( callback `$cmp_function` )

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

### 인수

`cmp_function`

  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.

### 반환값

값을 반환하지 않습니다.

### 예제

Example #1 ArrayObject::uksort() example

`<?php
function cmp($a, $b) {
$a = preg_replace('@^(a|an|the) @', '', $a);
$b = preg_replace('@^(a|an|the) @', '', $b);
return strcasecmp($a, $b);
}
$array = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);
$arrayObject = new ArrayObject($array);
$arrayObject->uksort('cmp');
foreach ($arrayObject as $key => $value) {
echo "$key: $value\n";
}
?>`

위 예제의 출력:

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

ArrayObject::uasort
SplFileInfo
ArrayObject
PHP Manual