两个数组中的公用值

Question

I have two arrays -

$x = [['email' => 'abc@gmail.com', 'id' => [1,2,3]],
      ['email' => 'xyz@gmail.com', 'id' => [4,5]]]
$y = ['email' => 'abc@gmail.com']

I have to return the common email in both the sets along with the ids in $x array.

The output should be -

$z = [['email' => 'abc@gmail.com', 'id' => [1,2,3]]

How to do it? array_intersect ? But for array_intersect both arrays should have same number of keys.

Answer 1

You need to do it in traditional way by using foreach loop:

$x = [
    ['email' => 'abc@gmail.com', 'id' => [1, 2, 3]],
    ['email' => 'xyz@gmail.com', 'id' => [4, 5]]
];
$y = array('email' => 'abc@gmail.com');

$z = array();

foreach($x as $arr){
    if(in_array($arr['email'],$y) !== false){
        $z[] = $arr;
    }
}

print_r($z);

Output:

Array
(
    [0] => Array
        (
            [email] => abc@gmail.com
            [id] => Array
                (
                    [0] => 1
                    [1] => 2
                    [2] => 3
                )

        )

)

Answer 2

You can use array_filter() with an anonymous function, passing to it a needle value by use directive:

$x = [
  ['email' => 'abc@gmail.com', 'id' => [1,2,3]],
  ['email' => 'xyz@gmail.com', 'id' => [4,5]]
];

$y = ['email' => 'abc@gmail.com'];

$matched = array_filter($x, function($item) use($y) {
  return $item['email'] === $y['email'];
});