Are there any common pitfalls to avoid when working with user input in PHP?

One common pitfall when working with user input in PHP is not properly sanitizing and validating the input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To avoid this, always sanitize and validate user input before using it in your code. 

// Sanitize and validate user input
$user_input = $_POST['user_input'] ?? ''; // Get user input from POST request
$user_input = trim($user_input); // Remove leading and trailing whitespaces
$user_input = htmlspecialchars($user_input); // Convert special characters to HTML entities

// Use the sanitized user input in your code
echo "User input: " . $user_input;

Keywords

SQL injection cross-site scripting (XSS) input validation htmlspecialchars filter_input

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