Restrict Image Size Uploads

Explanation:

function restrict_image_sizes_upload($file) {
    // Array of allowed image sizes
    $allowed_sizes = array(
        array('width' => 800, 'height' => 600),
        array('width' => 1024, 'height' => 768),
        array('width' => 1200, 'height' => 900),
    );

    // Get the image size
    $image_info = getimagesize($file['tmp_name']);
    if ($image_info) {
        $image_width = $image_info[0];
        $image_height = $image_info[1];

        // Check if the image size matches any allowed size
        $is_allowed = false;
        foreach ($allowed_sizes as $size) {
            if ($image_width == $size['width'] && $image_height == $size['height']) {
                $is_allowed = true;
                break;
            }
        }

        // If the size is not allowed, return an error
        if (!$is_allowed) {
            $file['error'] = 'This image size is not allowed. Please upload an image with one of the following sizes: '
                             . implode(', ', array_map(function ($size) {
                                   return $size['width'] . 'x' . $size['height'];
                               }, $allowed_sizes));
        }
    }

    return $file;
}

add_filter('wp_handle_upload_prefilter', 'restrict_image_sizes_upload');

function restrict_image_sizes_upload($file) {
    // Array of allowed image sizes
    $allowed_sizes = array(
        array('width' => 800, 'height' => 600),
        array('width' => 1024, 'height' => 768),
        array('width' => 1200, 'height' => 900),
    );

    // Get the image size
    $image_info = getimagesize($file['tmp_name']);
    if ($image_info) {
        $image_width = $image_info[0];
        $image_height = $image_info[1];

        // Check if the image size matches any allowed size
        $is_allowed = false;
        foreach ($allowed_sizes as $size) {
            if ($image_width == $size['width'] && $image_height == $size['height']) {
                $is_allowed = true;
                break;
            }
        }

        // If the size is not allowed, return an error
        if (!$is_allowed) {
            $file['error'] = 'This image size is not allowed. Please upload an image with one of the following sizes: '
                             . implode(', ', array_map(function ($size) {
                                   return $size['width'] . 'x' . $size['height'];
                               }, $allowed_sizes));
        }
    }

    return $file;
}

add_filter('wp_handle_upload_prefilter', 'restrict_image_sizes_upload');



• $allowed_sizes array: Contains the approved image dimensions (width x height) for uploads.

• The wp_handle_upload_prefilter filter intercepts the file before it is uploaded.

• The code uses getimagesize() to get the dimensions of the uploaded image and checks against the allowed sizes.

• If the uploaded image does not match any size in the $allowed_sizes array, an error message is shown to the user.

Customization:

Modify the $allowed_sizes array to include any specific image dimensions you need to allow.