function custom_array_merge(&$array1, &$array2) {

    $result = Array();

    foreach ($array1 as $key_1 => &$value_1) {

        // if($value['name'])

        foreach ($array2 as $key_1 => $value_2) {

            if($value_1['name'] ==  $value_2['name']) {

                $result[] = array_merge($value_1,$value_2);

            }

        }

​

    }

    return $result;

}

<?php

  $array1 = [

      "color" => "green"

  ];

  $array2 = [

      "color" => "red", 

      "color" => "blue"

  ];

  $result = array_merge($array1, $array2);

​

// $result

[

    "color" => "blue",

]

$all_arrays = array_merge($array1, $array2, $array3, ...);