Question

我有两个数组，我需要从较大的数组中删除

$a = array(223 => 6, 381 => 6);

和第二个数组是：

$b = array(array('id' => 45, 'username' => 'rock'), array('id' => 223, 'username' => 'pop'), array('id' => 381, 'username' => 'stock'));

使用print_r（），它们看起来像这样

Array
(
    [223] => 6
    [381] => 6
)

Array
(
    [0] => Array
        (
            [id] => 45
            [username] => rock
        )

    [1] => Array
        (
            [id] => 223
            [username] => pop
        )

    [2] => Array
        (
            [id] => 381
            [username] => stock
        )

)

如何从$ b数组中删除id！= $ a [keys] 所以在结果中我将有这样的数组

Array
(
    [0] => Array
        (
            [id] => 223
            [username] => pop
        )

    [1] => Array
        (
            [id] => 381
            [username] => stock
        )

)

我尝试使用array_diff，array_search和unset，但不知道如何使它工作。

Answer 1

因此，您希望过滤掉不存在$a[$sub_array["id"]]的值，其中$sub_array是$b的元素：

然后array_filter()就是您搜索的内容：

$array = array_filter($b, function ($val) use ($a) {
    return isset($a[$val["id"]]);
});

Answer 2

    $a = array(223 => 6, 381 => 6);
    $b = array(array('id' => 45, 'username' => 'rock'), array('id' => 223, 'username' => 'pop'), array('id' => 381, 'username' => 'stock'));
    $keys = array_keys($a);
    $new_array = array();
    for ($i = 0, $len = count($b); $i < $len; $i++) {
        $c = $b[$i];
        if (in_array($c['id'], $keys)) {
            $new_array[] = $c;
        }
    }
    var_dump($new_array);

Answer 3

<?php
$a = array(223 => 6, 381 => 6);
$b = array(array('id' => 45, 'username' => 'rock'), array('id' => 223, 'username' => 'pop'), array('id' => 381, 'username' => 'stock'));
$cc = 0;
foreach($b as $bb)
{
    $flag = 0;
    foreach($a as $k => $aa)
    {
        if($bb['id'] == $k)
        {
            $flag=1;
        }
    }
    if($flag == 0)
    {
        unset($b[$cc]);
    }
    $cc++;
}
print_r($b);

Answer 4

您希望首先使用array_keys从$ a获取所有密钥。然后循环遍历$ b并使用in_array，您将知道id是否为$ a键。最后使用unset。

$a = array(223 => 6, 381 => 6);
$aKey = array_keys($a);
$b = array(array('id' => 45, 'username' => 'rock'), array('id' => 223, 'username' => 'pop'), array('id' => 381, 'username' => 'stock'));
foreach ($b as $key => $value)
    if (!in_array($value['id'], $aKey))
        unset($b[$key]);
print_r($b);

比较两个数组并从PHP中的数组中删除数组

4 个答案: