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大家好
我這邊整理一下PHP常用的陣列排序功能
給大家參考

$test = array(
    'C' => '3',
    'B' => '5',
    'A' => '2',
    'D' => '4',
    'E' => '1',
    );

//sort:依照值 由小到大排序 (返回值不包含KEY)
sort($test);
print_r($test);
/*
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)
*/

//ksort:依照KEY 由小到大排序
ksort($test);
print_r($test);
/*
Array
(
    [A] => 2
    [B] => 5
    [C] => 3
    [D] => 4
    [E] => 1
)
*/

//krsort:依照KEY 由大到小排序
krsort($test);
print_r($test);
/*
Array
(
    [E] => 1
    [D] => 4
    [C] => 3
    [B] => 5
    [A] => 2
)
*/

//asort:依照值 由小到大排序
asort($test);
print_r($test);
/*
Array
(
    [E] => 1
    [A] => 2
    [C] => 3
    [D] => 4
    [B] => 5
)
*/

//arsort:依照值 由大到小排序
arsort($test);
print_r($test);
/*
Array
(
    [B] => 5
    [D] => 4
    [C] => 3
    [A] => 2
    [E] => 1
)
*/

//usort:依照值 由函式排序(返回值不包含KEY)
usort($test,function($a, $b){
    if ($a == $b) {
        return 0;
    }
    //2擺第一
    return ($a == 2 ? -1:($b == 2 ? 1:($a < $b ? -1 : 1)));
});
print_r($test);
/*
Array
(
    [0] => 2
    [1] => 1
    [2] => 3
    [3] => 4
    [4] => 5
)
*/

//uksort:依照KEY 由函式排序(返回值包含KEY)
uksort($test,function($a, $b){
    if ($a == $b) {
        return 0;
    }
    //B擺第一
    return ($a == 'B' ? -1:($b == 'B' ? 1:($a < $b ? -1 : 1)));
});
print_r($test);
/*
Array
(
    [B] => 5
    [A] => 2
    [C] => 3
    [D] => 4
    [E] => 1
)
*/

//uasort:依照值 由函式排序(返回值包含KEY)
uasort($test,function($a, $b){
    if ($a == $b) {
        return 0;
    }
    //2擺第一
    return ($a == 2 ? -1:($b == 2 ? 1:($a < $b ? -1 : 1)));
});
print_r($test);
/*
Array
(
    [A] => 2
    [E] => 1
    [C] => 3
    [D] => 4
    [B] => 5
)
*/

感恩!