Merge two 2D arrays

Array a before merging: {code ...} array B before merging: {code ...} merged array (merging condition, when the user_id of idb of a is merged): {code ...} array a before merging:

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

Array B before merging:

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

The merged array (Merging condition, where the id of a is = user_id of B.):

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

Reply content:

Array a before merging:

array (size=3)  0 =>     array (size=2)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=2)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)

Array B before merging:

array (size=2)  0 =>     array (size=2)      'user_id' => string '113' (length=2)      'count' => string '1' (length=1)  1 =>     array (size=2)      'user_id' => string '109' (length=2)      'count' => string '8' (length=1)

The merged array (Merging condition, where the id of a is = user_id of B.):

array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)      1 =>     array (size=3)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)      'count' => string '0' (length=1)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

The array_merge_recursive () function, like the array_merge () function, combines the elements of one or more arrays. The values of an array are appended to the values of the previous array. Returns an array of results.
However, unlike array_merge (), when duplicate key names exist, the value is not overwritten. Instead, multiple values with the same key name are recursively grouped into an array. (See example 1)

$ A1 = array ("a" => "Horse", "B" => "Dog ");
$ A2 = array ("c" => "Cow", "B" => "Cat ");
Print_r (array_merge_recursive ($ a1, $ a2 ));
?>
Output:
Array (
[A] => Horse
[B] => Array ([0] => Dog [1] => Cat)
[C] => Cow
)

$a = array(    array('id'=>'113','email'=>'yintx_1292342352@163.com'),     array('id'=>'111','email'=>'yintx_1293456456@163.com'),     array('id'=>'109','email'=>'yintx_129@99999.com')    );$b = array(    array('user_id'=>'113','count'=>'1'),     array('user_id'=>'109','count'=>'8')    );foreach($a as $ka=>$va){    foreach($b as $kb=>$vb){        if($va['id'] == $vb['user_id']){            $a[$ka]['count'] = $vb['count'];        }    }}var_dump($a);----------array (size=3)  0 =>     array (size=3)      'id' => string '113' (length=3)      'email' => string 'yintx_1292342352@163.com' (length=24)      'count' => string '1' (length=1)  1 =>     array (size=2)      'id' => string '111' (length=3)      'email' => string 'yintx_1293456456@163.com' (length=24)  2 =>     array (size=3)      'id' => string '109' (length=3)      'email' => string 'yintx_129@99999.com' (length=19)      'count' => string '8' (length=1)

Array_merge_recursive ($ a, $ B );