How to merge two arrays of object in PHP

Question

I have the following two arrays of objects:

First Array: $array1

Array
(
    [0] => stdClass Object
        (
            [id] => 100
            [name] => Muhammad
        )

    [1] => stdClass Object
        (
            [id] => 102
            [name] => Ibrahim
        )

    [2] => stdClass Object
        (
            [id] => 101
            [name] => Sumayyah
        )
)

Second Array: $array2

Array
(
    [0] => stdClass Object
        (
            [id] => 100
            [name] => Muhammad
        )

    [1] => stdClass Object
        (
            [id] => 103
            [name] => Yusuf
        )
)

I want to merge these two object arrays (removing all duplicates) and sorted according to id.

Desired output:

Array
(
    [0] => stdClass Object
        (
            [id] => 100
            [name] => Muhammad
        )

    [1] => stdClass Object
        (
            [id] => 101
            [name] => Sumayyah
        )

    [2] => stdClass Object
        (
            [id] => 102
            [name] => Ibrahim
        )

    [3] => stdClass Object
        (
            [id] => 103
            [name] => Yusuf
        )
)

Answer 1

These 3 simple steps did the work:

//both arrays will be merged including duplicates $result = array_merge( $array1, $array2 ); //duplicate objects will be removed $result = array_map("unserialize", array_unique(array_map("serialize", $result))); //array is sorted on the bases of id sort( $result ); 

Note: Answer by @Kamran helped me come to this simple solution

Answer 2

UPDATE

I am posting the entire code listing here now instead of the previously posted main code, printing both input and output. You can simply copy and paste this code to test.

<?php  function array_to_object($arr) {     $arrObject = array();     foreach ($arr as $array) {         $object = new stdClass();         foreach ($array as $key => $value) {             $object->$key = $value;         }         $arrObject[] = $object;     }      return $arrObject; }  function super_unique($array) {     $result = array_map("unserialize", array_unique(array_map("serialize", $array)));     foreach ($result as $key => $value)  {         if ( is_array($value) ) {           $result[$key] = super_unique($value);         }     }     return $result; }  function merge_arrays($arr1, $arr2) {     $arr1 = (array)$arr1;     $arr2 = (array)$arr2;     $output = array_merge($arr1, $arr2);     sort($output);     return super_unique($output); }  $array1 = array(         array("id" => "100", "name" => "muhammad"),          array("id" => "102", "name" => "ibrahim"),          array("id" => "101", "name" => "summayyah"),      ); $array1 = array_to_object($array1);  print "<h3>Your array 1</h3>"; print "<pre>"; print_r($array1); print "</pre>";  $array2 = array(         array("id" => "100", "name" => "muhammad"),          array("id" => "103", "name" => "yusuf"),      ); $array2 = array_to_object($array2);  print "<h3>Your array 2</h3>"; print "<pre>"; print_r($array2); print "</pre>";  $result = merge_arrays($array1, $array2);  print "<h3>Your desired output</h3>"; print "<pre>"; print_r($result); print "</pre>"; 

it will output the following:

Your array 1 Array (     [0] => stdClass Object         (             [id] => 100             [name] => muhammad         )      [1] => stdClass Object         (             [id] => 102             [name] => ibrahim         )      [2] => stdClass Object         (             [id] => 101             [name] => summayyah         )  )  Your array 2 Array (     [0] => stdClass Object         (             [id] => 100             [name] => muhammad         )      [1] => stdClass Object         (             [id] => 103             [name] => yusuf         )  )  Your desired output Array (     [0] => stdClass Object         (             [id] => 100             [name] => muhammad         )      [2] => stdClass Object         (             [id] => 101             [name] => summayyah         )      [3] => stdClass Object         (             [id] => 102             [name] => ibrahim         )      [4] => stdClass Object         (             [id] => 103             [name] => yusuf         )  ) 

Answer 3

Assignments:

1. Merge
2. Remove Duplicates
3. Sort by id

The good news is: Assigning temporary keys using id values does all of the hard work for you. No serializing is needed.

• array_merge() joins the arrays together.
• array_column() with a null 2nd parameter leaves the objects unmodified and id as the 3rd parameter assigns the temporary keys. Because arrays cannot have duplicate keys, duplicate objects are weeded out in this step.
• Now that we have keys, ksort() avoids calling the more convoluted usort() to sort by id ascending.
• Finally, call array_values() to re-index the resultant array (remove the temporary keys).

Code: (Demo)

$array1 = [
    (object) ['id' => 100, 'name' => 'Muhammad'],
    (object) ['id' => 102, 'name' => 'Ibrahim'],
    (object) ['id' => 101, 'name' => 'Sumayyah']
];

$array2 = [
    (object) ['id' => 100, 'name' => 'Muhammad'],
    (object) ['id' => 103, 'name' => 'Yusuf']
];

$merged_keyed = array_column(array_merge($array1,$array2), NULL, 'id');
ksort($merged_keyed);
print_r(array_values($merged_keyed));

Output:

Array
(
    [0] => stdClass Object
        (
            [id] => 100
            [name] => Muhammad
        )    
    [1] => stdClass Object
        (
            [id] => 101
            [name] => Sumayyah
        )    
    [2] => stdClass Object
        (
            [id] => 102
            [name] => Ibrahim
        )    
    [3] => stdClass Object
        (
            [id] => 103
            [name] => Yusuf
        )    
)