What are the best practices for handling user input and dynamically generating PHP content based on that input?

When handling user input in PHP, it is crucial to sanitize and validate the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. To dynamically generate content based on user input, use conditional statements or switch cases to determine the output based on the input provided. 

<?php
// Sanitize and validate user input
$user_input = isset($_GET['input']) ? $_GET['input'] : '';
$user_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Dynamically generate content based on user input
if($user_input === 'option1'){
    echo "Content for option 1";
} elseif($user_input === 'option2'){
    echo "Content for option 2";
} else {
    echo "Default content";
}
?>

Keywords

input validation user input sanitization dynamic content generation PHP functions security vulnerabilities

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