Question

我的第一个数组是

Array (
 [0] => Array
     (
         [user_id] => 1
         [name] => name1
     )

 [1] => Array
     (
        [user_id] => 2
        [name] => name2
    )
)

我的Secondarray是

Array (
 [0] => Array
     (
         [user_id] => 2
         [name] => name2
     )

 [1] => Array
     (
        [user_id] => 3
        [name] => name3
    )
)

公共数组是user_id = 2的数组如何选择该数组？我想要那两个数组的交集。

Answer 1

<?php
$array1 = array(
    array(
        'user_id' => 1,
        'name'    => 'foo'
     ), 
    array(
        'user_id' => 2,
        'name'    => 'foobar'
    )
);
$array2 = array(
    array(
        'user_id' => 2,
        'name'    => 'foobar'
    ), 
    array(
       'user_id' => 3,
       'name'    => 'baz'
    )
);

/**
 * Return the common sub_array of tow arrays with tow dimensions
 *
 * @param $arrayA - the first tow dimension array
 * @param $arrayB - the second tow dimension array
 *
 * @return array - an empty array in case the tow arrays don't
 * have any common elements, otherwise an tow dimension array
 * containing the common elements
 */
function get_common_array($arrayA, $arrayB) {
    $result = array();

    foreach($arrayA as $keyA=>$sub_arrayA) {
        foreach($sub_arrayA as $metadata=>$data) {
            if('user_id' === $metadata) {
                foreach($arrayB as $keyB=>$sub_arrayB){
                   if(in_array($data, $sub_arrayB)) {
                        $result[] = $sub_arrayB;
                    }
                }
            }
        } 
    }

    return $result;
}

var_dump(get_common_array($array1, $array2));

这是一种解决方法，但如果我考虑改变两个数组的几何形状，以便能够使用PHP中实现的专用函数，那么这就快了。

从两个多维数组中选择常见数组 - PHP

1 个答案: