in_array command does not work

Question

in_array function, for some reason, return false;

This is the code i'm using:

$query = "SELECT users_invites.invite_user_id
          FROM users_invites
          JOIN users ON users.id = users_invites.user_id AND users_invites.user_id =". param('session_id')."
          ORDER BY users.id ASC";

$response = $this->_db->query($query)->result_array();

 foreach ($response as $key => $value)
 {
    if (!in_array($_REQUEST['invite_user_id'][$key],$response[$key]))
        $this->_db->insert("users_invites",array("user_id"=> param('session_id') , "invite_user_id"=>$_REQUEST['invite_user_id'][$key]));


 } 

The in_array function dosen't work and the insertion command is always execute. Any idea?

P.S: The invite_user_id is an array. Edit: The response value is:

Array
(
    [0] => Array
        (
            [invite_user_id] => 20
        )

    [1] => Array
        (
            [invite_user_id] => 19
        )

    [2] => Array
        (
            [invite_user_id] => 3
        )

)

The $_REQUEST['invite_user_id'] Values:

Array
(
    [0] => 3
    [1] => 4
)

Answer 1

Given your resulting structure, I would do a foreach on the data to break it into single set of array with all the ids returned from the table.

From there I would foreach the $_REQUEST['invite_user_id'] against the new array $ids, here is a sample:

$ids = array();
foreach ($response as $item)
{
   $ids[] = $item['invite_user_id'];
}

foreach ($_REQUEST['invite_user_id'] as $id) 
{
    if (!in_array($id, $ids))
    {
        echo "{$id} was not found...\n";
    }
    else
    {
        echo "{$id} was found...\n";
    }
}

And here is a live DEMO.

Answer 2

your request should be like this

$query = "SELECT users_invites.invite_user_id
          FROM users_invites
          JOIN users ON users.id = users_invites.user_id AND users_invites.user_id =". param('session_id')."
          ORDER BY users.id ASC";

$response = $this->_db->query($query)->result_array();

$invite_user_id = array();


 foreach ($response as $key => $value)
 {
   $invite_user_id[] = $value;
 }

 foreach( $_REQUEST['invite_user_id'] AS $key => $value )
 {
      if ( !in_array( $value,$invite_user_id) )
      {
       $this->_db->insert("users_invites",array("user_id"=> param('session_id') , "invite_user_id"=> $value));
      }
 }

Answer 3

The follow should work well:

$query = 'SELECT users_invites.invite_user_id
            FROM users_invites
            JOIN users ON users.id = users_invites.user_id AND
                 users_invites.user_id = ' . param('session_id') . '
        ORDER BY users.id ASC';
$response = $this->_db->query($query)->result_array();

$storedInvites = array();
foreach ($response as $index => $data) {
    $storedInvites[] = $data['invite_user_id'];
}

foreach ($_REQUEST['invite_user_id'] as $index => $inviteUserId) {
    if (!in_array($inviteUserId, $storedInvites)) {
        $insertData =  array(
            'user_id' => param('session_id'),
            'invite_user_id' => $inviteUserId
        );

        $this->_db->insert('users_invites', $insertData);
    }
}