正如人们所说，array_unique()非常慢，下面是我用于一个层次的多维数组的代码片段。

$serialized_array = array_map("serialize", $input);

foreach ($serialized_array as $key => $val) {
     $result[$val] = true;
}

$output = array_map("unserialize", (array_keys($result)));

在php.net中引用array_unique()函数页面的第一个用户贡献的注释

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => john
        )

    [1] => Array
        (
            [id] => 2
            [name] => smith
        )

    [2] => Array
        (
            [id] => 3
            [name] => john
        )

    [3] => Array
        (
            [id] => 4
            [name] => robert
        )

)

$temp = array_unique(array_column($array, 'name'));
$unique_arr = array_intersect_key($array, $temp);

这将从数组中删除重复的名称。按键唯一

序列化和惟一的替代方案

$test = [ ['abc','def'], ['ghi','jkl'], ['mno','pql'], ['abc','def'], ['ghi','jkl'], ['mno','pql'], ]; $result = array_reduce( $test, function($carry,$item){ if(!in_array($item,$carry)) { array_push($carry,$item); } return $carry; }, [] ); var_dump($result); /* php unique.php array(3) { [0] => array(2) { [0] => string(3) "abc" [1] => string(3) "def" } [1] => array(2) { [0] => string(3) "ghi" [1] => string(3) "jkl" } [2] => array(2) { [0] => string(3) "mno" [1] => string(3) "pql" } } */

根据标记为正确的答案，添加我的答案。添加的小代码只是为了重置索引-

$input = array_values(array_map("unserialize", array_unique(array_map("serialize", $inputArray))));

唯一一个多维数组的简单而合理的方法如下:

如果你有一个这样的数组:

Array
(
    [Key1] => Array
        (
            [0] => Value1
            [1] => Value2
            [2] => Value1
            [3] => Value3
            [4] => Value1
        )
    [Key2] => Array
        (
            [0] => Value1
            [1] => Value2
            [2] => Value1
            [3] => Value3
            [4] => Value4
        )
)

使用foreach来解决这个问题:

foreach($array as $k=>$v){
    $unique=array_unique($v);
    $array[$k]=$unique;
}

它会给你以下结果:

Array
(
    [Key1] => Array
        (
            [0] => Value1
            [1] => Value2
            [3] => Value3
        )
    [Key2] => Array
        (
            [0] => Value1
            [1] => Value2
            [3] => Value3
            [4] => Value4
        )
)

如果你想重新排列键的顺序，

foreach($array as $k=>$v){
    $unique= array_values(array_unique($v));
    $array[$k]=$unique;
}

这个操作会给你这样排列的键值:

Array
(
    [Key1] => Array
        (
            [0] => Value1
            [1] => Value2
            [2] => Value3
        )
    [Key2] => Array
        (
            [0] => Value1
            [1] => Value2
            [2] => Value3
            [3] => Value4
        )
)

我希望这能澄清一切。

一个简单的解决方案，可能不是最有效的:

function arrayUnique($myArray){
    if(!is_array($myArray))
        return $myArray;

    foreach ($myArray as &$myvalue){
        $myvalue=serialize($myvalue);
    }

    $myArray=array_unique($myArray);

    foreach ($myArray as &$myvalue){
        $myvalue=unserialize($myvalue);
    }

    return $myArray;

}