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

Extract to an array and index by contact_email. Since there cannot be duplicate indexes you'll get the last occurrence:

$array = array_column($array, null, 'contact_email');

If you want to re-index that back to integers:

$array = array_values(array_column($array, null, 'contact_email'));