What potential issue can arise when $_POST or $_GET variables are not cleared after processing in PHP?

If $_POST or $_GET variables are not cleared after processing in PHP, it can lead to security vulnerabilities such as injection attacks or unintended data manipulation. To prevent this, it is important to unset or clear these variables once they are no longer needed in the script. 

// Process the form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process the form data

    // Clear the $_POST variables
    $_POST = array();
}

Keywords

Security vulnerability SQL injection Cross-site scripting Data manipulation Input validation

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