What are the potential security risks associated with creating a file hosting website using PHP, especially for a beginner with limited knowledge?

One potential security risk associated with creating a file hosting website using PHP is the possibility of allowing users to upload malicious files that could harm the server or compromise user data. To mitigate this risk, beginners should implement file type validation and restriction to only allow safe file types to be uploaded. 

// File type validation and restriction
$allowedTypes = array('image/jpeg', 'image/png', 'image/gif');
if (!in_array($_FILES['file']['type'], $allowedTypes)) {
    die('Invalid file type. Only JPEG, PNG, and GIF files are allowed.');
}

Keywords

File uploading PHP security vulnerabilities Cross-site scripting (XSS) SQL injection Server-side request forgery (SSRF)

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