What are common pitfalls when passing form data in PHP using the POST method?

Common pitfalls when passing form data in PHP using the POST method include not properly sanitizing user input, not checking for empty fields, and not handling file uploads correctly. To solve these issues, always sanitize user input to prevent SQL injection and other attacks, validate and check for empty fields to ensure data integrity, and handle file uploads securely to prevent security vulnerabilities. 

// Sanitize user input
$name = htmlspecialchars($_POST['name']);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Validate and check for empty fields
if(empty($name) || empty($email)) {
    echo "Please fill out all required fields.";
} else {
    // Handle form data
}

// Handle file uploads securely
if(isset($_FILES['file'])) {
    $file_name = $_FILES['file']['name'];
    $file_tmp = $_FILES['file']['tmp_name'];
    move_uploaded_file($file_tmp, "uploads/" . $file_name);
}

Keywords

POST method form data PHP security vulnerabilities data validation

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