PHP remove array of associative array that have a duplicate values of specific key

Question

I\'ve a array of associative array

array(xxx) {
 [0]=>
   array(3) {
    [\"group_id\"]=>2
    [\"contact\"]=> \"foo\"
    [\"contact_email\"]=> \"fo         


        

Answer 1

I think this can help

$arr = [['contact_email' => 'a@a.com'], ['contact_email' => 'a@a.com'], ['contact_email' => 'b@a.com']];
$result = [];
array_map(function ($item) use (&$result) {
    $result[$item['contact_email']] = $item;
}, $arr);
print_r($result);