PHP-检查多维数组中的相同值

Question

我有一个像这样的数组：

[input] => Array (
    [0] => Array ( [val1] => 111 [val2] => 222 [val3] => 333 [day] => 444 )          
    [1] => Array ( [val1] => 111 [val2] => 221 [val3] => 333 [day] => 444 ) 
    [2] => Array ( [val1] => 111 [val2] => 223 [val3] => 333 [day] => 444 ) 
    [3] => Array ( [val1] => 111 [val2] => 224 [val3] => 333 [day] => 444 )
    [4] => Array ( [val1] => 111 [val2] => 222 [val3] => 333 [day] => 444 ) 
           ) 

我只想检查数组中的前2个值（val1和val2）是否与另一个数组相同。 就像上面示例中的input [0]和input [4]一样。 我该如何在php中做到这一点？

我不想删除重复的数组，我只想返回重复的值以备将来使用。

谢谢

Answer 1

您只需要用于存储这些键的数组：

$uniq = array();
foreach($input as $v) {
    $key = $v['val1'] . '-' . $v['val2'];
    if (!isset($uniq[$key]))
        $uniq[$key] = 0;
    else
        $uniq[$key]++;
}
print_r(array_filter($uniq));