Checkbox removing listing in a random way

Question

I have a list of favorite cars which i have added to each favorite car a checkbox for letting the user to remove the favorite car from his favorite car list. The problem is that the checkbox is working in a different way: If I check any car (1st, second.. last or multiple cars) and after hit submit the car that will get removed is the last one added instead of removing the selected one. If I check multiple cars, happens same thing, removes only the last car added.

PHP

public function GetFavoriteCars() {
  include("inc/membersite_config.php");
  $email = $fgmembersite->UserEmail(); // this is how I take the e-mail of the 
  global $base_path;
  $FavoriteCars = $this->QueryResult("SELECT * FROM favoritecar WHERE email='$email'"); 
    if (count($FavoriteCars)) {
        $mystring='http://';
    echo '<form action="" class="deletebutton" method="post">';
    echo '<input type="submit" name="deletebtn" id="deletebtn" value="Submit">';
    echo '<div class="roster_slideri-login">';
        foreach ($FavoriteCars as $FavoriteCar) {
      $carlink = $FavoriteCar->favoritecarlink;
      echo '<div class="car-info-col-login">';
      echo '<input type="checkbox" name="checkbox" value="'.$carlink.'" class="checkbox-login">';
      $val=strpos($FavoriteCar->favoritecarimg,$mystring);
    if ($val !== false) {
      if($FavoriteCar->favoritecarimg!='') {
                echo '<a href="'.$base_path.'detail-page_'.$FavoriteCar->favoritecarlink.'">';
                echo '<img src="'.$FavoriteCar->favoritecarimg.'" alt="'.$FavoriteCar->favoritecartitle.'" width="160" height="120" />';
        echo '</a>';
                echo '<div class="name">'.substr($FavoriteCar->favoritecartitle,0,20).'</div>';
        echo '</div>'; //car-info-col-login
              }
            } else {
    echo '<a href="'.$base_path.'detail-page_'.$FavoriteCar->favoritecarlink.'">';
            echo '<img src="'.$base_path.'uploads/no-img.jpg" alt="'.$FavoriteCar->favoritecartitle.'" width="160" height="120" />';
    echo '</a>';
            echo '<div class="name">'.substr($FavoriteCar->favoritecartitle,0,20).'</div>';
            echo '</div>'; 
            } 
        }
    echo '</form>';
        if (isset($_POST["checkbox"])) {
      $this->QueryResult("DELETE from favoritecar WHERE email='$email' AND favoritecarlink='$carlink'");
      echo '<script type="text/javascript">alert("Car had been deleted");</script>';
        }
      echo '</div>'; // div roster_slideri-login
    }
}

Explaning:

$email = $fgmembersite->UserEmail(); - this is how I take the e-mail of the current logged in user. It will echo "email_of_logged_in_user@domain.com"

QueryResult is a custom function that looks like this. I usually use it for SELECTING purposes but it seams that is working for deleting purposes too.

abstract class DBDetails {

    protected $link = NULL;

    protected function connector() {
        global $DBHOSTNAME;
        global $DBUSERNAME;
        global $DBPASSWORD;
        global $DBNAME;
        $this->link = mysqli_connect($DBHOSTNAME, $DBUSERNAME, $DBPASSWORD, $DBNAME) or die("Can't connect to MySQL server on localhost");
    }

      protected function close() {
        mysqli_close($this->link);
      }
    }

     abstract class N2 extends DBDetails {
      public function QueryResult($strQuery) {
        $this->connector();
        $query = mysqli_query($this->link, $strQuery);
        $arr = array();
        if ($query) {
            while ($result = mysqli_fetch_object($query)) {
                array_push($arr, $result);
            }
        }
        $this->close();
        return $arr;
      }   
    }

Expected output

When I check the checkbox of a car, it should delete only that car. If I check the checkboxes of multiple cars, should delete the specific cars that I checked.

Please help, I am quite a noob in checkboxes. I have checked lots of questions from here, but did not find my answer.

Answer 1

In this line :

  echo '<input type="checkbox" name="checkbox" value="'.$carlink.'" class="checkbox-login">';
                               --------------

When using multiple checkboxes with same name , you would need to include [] in the name :

  echo '<input type="checkbox" name="checkbox[]" value="'.$carlink.'" class="checkbox-login">';
                               ----------------

Then $_POST["checkbox"] will be an array and you can use foreach on it to get all the checked values .

if( isset( $_POST["checkbox"] ) )
{
    foreach( $_POST["checkbox"] as $value )
    {
        /* $value contains $carlink */

        echo $value;    // For test purpose

        /* Sanitize and use it to identify and delete the corresponding row */
    }
}

( Rather than name="checkbox[]" it might be better to choose another name . )