What are common pitfalls when handling form submissions in PHP, particularly when using the POST method?

One common pitfall when handling form submissions in PHP using the POST method is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, always use functions like htmlspecialchars() or mysqli_real_escape_string() to sanitize input before using it in SQL queries or displaying it on the page. 

// Example of sanitizing user input before using it in a SQL query
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);

$sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
$result = mysqli_query($conn, $sql);

Keywords

form submissions POST method validation security error handling

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