What are the best practices for handling user input and generating dynamic content in PHP?

When handling user input in PHP, it is important to sanitize and validate the data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. To generate dynamic content, use PHP to dynamically generate HTML based on user input or other variables. Example: 

// Sanitize and validate user input
$user_input = $_POST['user_input'];
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Generate dynamic content
echo "<h1>Welcome, " . $clean_input . "!</h1>";

Keywords

validation sanitization XSS htmlentities prepared statements

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