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PHP code is not excluding the watched videos.

Can someone explain why this PHP code is not excluding the watched videos?

The `email_id` parameter is used to specify the location of the watched videos array. The code should remove the `watched_videos` array from the user table, but it's not working as expected. Since the `watched_videos` array is stored as a string, it needs to be converted to an array. Additionally, I want the code to exclude watched videos when the `video_id` is sent back in an AJAX request.

```php
<?php

// Database credentials

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "refwebsite";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Get the start and limit parameters
$start = 1;
$limit = 12;
$email_id = "clins@gmail.com";

// Get the watched_videos array for the user with the given email_id
$sql_watched = "SELECT watched_videos FROM users WHERE email_id='$email_id'";
$result_watched = mysqli_query($conn, $sql_watched);
$row_watched = mysqli_fetch_assoc($result_watched);
$watched_videos = explode(",", $row_watched['watched_videos']);

// Generate a comma-separated list of unique_id values to exclude
$exclude_list = implode(",", $watched_videos);

// Select two random videos from the "less_videos" table, excluding watched videos
$sql_less = "SELECT video_id, description, points FROM less_videos WHERE unique_id NOT IN ('" . implode("', '", $watched_videos) . "') ORDER BY RAND() LIMIT 2";
$result_less = mysqli_query($conn, $sql_less);

// Select ten random videos from the "more_videos" table, excluding watched videos
$sql_more = "SELECT video_id, description, points FROM more_videos WHERE unique_id NOT IN ('" . implode("', '", $watched_videos) . "') ORDER BY RAND() LIMIT 10";
$result_more = mysqli_query($conn, $sql_more);

// Combine the selected videos into a single array
$data = array();
while ($row = mysqli_fetch_assoc($result_less)) {
    $data[] = $row;
}
while ($row = mysqli_fetch_assoc($result_more)) {
    $data[] = $row;
}

// Shuffle the array to randomize the order of videos
shuffle($data);

// Extract the required subset of videos
$data_subset = array_slice($data, $start, $limit);

// Return the data as JSON
echo json_encode($data_subset);

// Close the connection
mysqli_close($conn);
?>

```