What are common mistakes to avoid when using POST functions in PHP for form submissions?

Common mistakes to avoid when using POST functions in PHP for form submissions include not checking if the form has been submitted, not validating user input, and not sanitizing input data to prevent SQL injection attacks. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate user input
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Sanitize input data
    $username = htmlspecialchars($username);
    $password = htmlspecialchars($password);
    
    // Process the form submission
    // Add your code here
}

Keywords

PHP POST functions form submissions security vulnerabilities data validation

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