在数组中搜索数组并返回键

Question

我有两个数组

1 $ IDS;

Array
(
    [0] => 2427975642
    [1] => 2397521678
)

2 $ C

Array
(
    [48] => 2397521678
    [46] => 461
    [45] => 451
)

问题： 从$ c中的$ ids中搜索值，并返回带有id的新数组。示例返回48

Answer 1

查看函数array_intersect：http://php.net/manual/en/function.array-intersect.php

Answer 2

$ids = array(   
    2427975642,
    2397521678
);



$c = array(
    48 => 2397521678,
    46 => 461,
    45 => 451
);

$common = array_keys(array_intersect($c, $ids));

print_r($common);

Answer 3

    $ids= array
    (
        [0] => 2427975642
        [1] => 2397521678
    );

    $c =array
    (
        [48] => 2397521678
        [46] => 461
        [45] => 451
    );

$res = array_intersect($ids,$c);
$keys = array_keys($res);
print_r($keys);

Answer 4

$ids = array(   
    2427975642,
    2397521678
);



$c = array(
    48 => 2397521678,
    46 => 461,
    45 => 451
);

$finalArray = array();

foreach ( $c as $key=>$val)
{

if ( array_search($val,$ids))
{

$finalArray[]=$key;

}

}