What potential issue is the user facing with the image upload on their website?

The potential issue the user is facing with the image upload on their website could be related to file size limitations. To solve this issue, the user can set a maximum file size limit for the uploaded images in their PHP code. This will help prevent users from uploading excessively large files that could potentially slow down the website or exceed server storage limits.

// Set maximum file size limit for image uploads (in bytes)
$maxFileSize = 5242880; // 5MB

if ($_FILES['image']['size'] > $maxFileSize) {
    // Display an error message to the user
    echo "Error: File size exceeds the maximum limit of 5MB.";
    // Optionally, you can also prevent the file from being uploaded
    // by adding an exit statement here or any other necessary action
}