What are the potential pitfalls of copying code from tutorials without understanding its functionality?

Copying code from tutorials without understanding its functionality can lead to several pitfalls such as introducing bugs or security vulnerabilities into your own code, as well as hindering your ability to troubleshoot and modify the code in the future. To avoid these issues, it is important to take the time to understand the code you are using and make any necessary modifications to fit your specific requirements.

// Example of how to avoid blindly copying code from tutorials
// Instead of directly copying the code, take the time to understand its functionality and make necessary modifications

// Original code from tutorial
$variable = $_POST['input'];

// Modified code with proper validation
if(isset($_POST['input'])){
    $variable = $_POST['input'];
    // Additional validation or sanitization logic here
} else {
    // Handle error or set default value
    $variable = 'default';
}