How to delete data based on value in session variable

Answer 1

The Problem -- What you should do:

You basically have to populate the SESSION variable like this:

$_SESSION["auctionImages"] = array(
    "IMG_2923.JPG", "IMG_2924.JPG"
);

You're meant to address each element therefore, like this:

$_SESSION["auctionImages"][$n];

$n is the numbered index value for a particular element in the array. Therefore, if $n is 0, the array would return "IMG_29.29.JPG" and if the $n is 1, the array would return "IMG_2924.JPG".

However, you are populating the array like this:

$_SESSION["auctionImages"][] = array(
    "IMG_2923.JPG", "IMG_2924.JPG"
);

If you dump this array, it will give you:

array(
    array(
        "IMG_2923.JPG", "IMG_2924.JPG"
    )
);

Which is not the behaviour you require.

Solution

$filename  = $_FILES["file"]["name"];
if(!is_array($_SESSION["auctionImages"])) {
    $_SESSION["auctionImages"] = [];
}
$_SESSION["auctionImages"][] = $filename;

This is more shorter, cleaner and neater.

Also, you can use the alternative array syntax which is [ and ]. So, you can declare arrays using $var = []; which is shorter than $var = array();.

Firstly, the variable $a is the text to be searched in the array.

$key = array_search($a, $_SESSION["auctionImages"]);

if ($key !== false) {
    unset($_SESSION["auctionImages"][$key]);
}

This is the second part of the code. This is all you need to have.

Also, make sure you have started the session by invoking session_start() in the top of the file if you haven't done yet.

A few comments

• Consider taking a look at the Unofficial PHP standards here. It would be better if you name your variables in $camelCase. Therefore, it would be better to rename $filename to $fileName.
• Also good job on using strict comparison which is !==.
• Also, use more meaningful variable names. $a does not make sense. Something like $searchString would be really meaningful and the code will self-document your code.

Links

is_array - Returns TRUE if the passed identifier is an array, otherwise returns FALSE.

---

Let's now solve the problem with the full code you have given me. Let's start with delete.php:

'; 
    print_r($_SESSION['auctionImages']); 
}

Now, let's fix your UploadImages.php file:

prepare("INSERT INTO image (user_id, related_id, related_type, url) VALUES (:uid, :id, 'gallery', :url)");
            $stmt->bindParam(':uid', $_SESSION['user']['id']);
            $stmt->bindParam(':id', $_GET['id']);
            $stmt->bindParam(':url', $imageName);
            $stmt->execute();
        }
        else {
            $_SESSION["auctionImages"][] = $fileName;
        }

    }                                               
}