What potential issues or errors could arise from the code provided for the gallery?

One potential issue could be that the code does not handle file extensions properly, leading to potential security vulnerabilities if users are able to upload malicious files. To solve this issue, you can add a check to ensure that only image files (e.g., jpg, png, gif) are allowed to be uploaded. 

// Check if the uploaded file is an image
$allowedExtensions = array('jpg', 'jpeg', 'png', 'gif');
$extension = pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION);

if (!in_array($extension, $allowedExtensions)) {
    echo "Only image files are allowed to be uploaded.";
    exit;
}

// Rest of the code for uploading the image goes here

Keywords

SQL injection file upload vulnerability cross-site scripting image file validation directory traversal

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