Array intersect of array of objects

Question

I have two arrays that contain friend objects. I want to find the IDs that match each other to implement mutual friends functionality. If it's too complicated using PHP, maybe I'll do it in the mysql way.

These are example array items:

$array1 = array(1) {
["friends_list"]=>
array(3) {
[0]=>
object(stdClass)#29 (8) {
  ["notifica_ID"]=>
  string(4) "2673"
}
[1]=>
object(stdClass)#30 (8) {
  ["notifica_ID"]=>
  string(4) "3532"
}
[2]=>
object(stdClass)#31 (8) {
  ["notifica_ID"]=>
  string(4) "3649"
}
}
}

$array2 = array(1) {
["friends_list"]=>
array(5) {
[0]=>
object(stdClass)#32 (8) {
  ["notifica_ID"]=>
  string(4) "1679"
}
[1]=>
object(stdClass)#33 (8) {
  ["notifica_ID"]=>
  string(4) "2137"
}
[2]=>
object(stdClass)#35 (8) {
  ["notifica_ID"]=>
  string(4) "3186"
}
[3]=>
object(stdClass)#36 (8) {
  ["notifica_ID"]=>
  string(4) "3187"
}
[4]=>
object(stdClass)#37 (8) {
  ["notifica_ID"]=>
  string(4) "3649"
}
}
}

I want to the result to be:

$result = array(1) {
["friends_list"]=>
array(1) {
[0]=>
array(
  ["notifica_ID"]=>
  string(4) "3649"
)
}
}

I have already tried array_intersect method but I don't know how can I implement it in array of objects.

No need to apologise. It's a community aimed at improving the questions and answers. — dave
– dave, Commented Jun 30, 2015 at 6:09

syed suleman · Accepted Answer · 2015-06-30 04:50:11Z

2

Not straightforward solution, But this will work..

$new_array1 =   obj_to_array( $array1["friends_list"] );
$new_array2 =   obj_to_array( $array2["friends_list"] );

$temp_result    =   array_uintersect( $new_array1, $new_array2, 'compare_values' );

$result =   array( "friends_list" => $temp_result );

function obj_to_array( $input1 )
{
    foreach( $input1 as $new )
        $temp_array[]   =   (array)$new;

   return $temp_array;
}
function compare_values($input1, $input2)
{
   return strcmp($input1['notifica_ID'], $input2['notifica_ID']);
}

$result is what you are expecting.

answered Jun 30, 2015 at 4:50

syed suleman

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Comments

John Christian De Chavez · Accepted Answer · 2015-06-30 05:58:11Z

I decided to put id's in other arrays. then do the array_intersect method. this is now my answer.

public function mutual_friends($my_ID = '' ,$friend_ID = ''){
    if($friend_ID != '' OR $my_ID != ''){
        $myfr = $this->get_friends($my_ID);
        $frofmy = $this->get_friends($friend_ID);            
        $array1 = array();
        $array2 = array();
        foreach($myfr['friends_list'] as $row){
            $array1[] = $row->notifica_ID;
        }
        foreach($frofmy['friends_list'] as $row){
            $array2[] = $row->notifica_ID;
        }
        $result = array_intersect($array1,$array2);
        if(count($result) > 0){
            $mf = array();
            $i = 0;
            foreach($myfr['friends_list'] as $row){
                foreach($result as $row1){
                    if($row1 == $row->notifica_ID){
                        $mf[$i]['notifica_ID'] = $row->notifica_ID;
                        $i++;
                    }
                }
            }
            return $mf;
        }
        else{
            return false;
        }
    }else{
        return false;
    }
}

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