What potential pitfalls should be considered when extracting information from a URL using PHP?

One potential pitfall when extracting information from a URL using PHP is not properly sanitizing user input, which could lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, it is important to validate and sanitize any user input before using it in a URL. 

// Example of sanitizing user input when extracting information from a URL
$url = filter_var($_GET['url'], FILTER_SANITIZE_URL);

// Use the sanitized URL in your code
echo "Extracted URL: " . $url;

Keywords

URL parsing security vulnerabilities PHP superglobals input validation cross-site scripting

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