How can one ensure the security and functionality of a PHP script before integrating it into a project?

To ensure the security and functionality of a PHP script before integrating it into a project, one should thoroughly review the code for any potential vulnerabilities such as SQL injection, cross-site scripting, or file inclusion attacks. Additionally, testing the script in a controlled environment and using input validation and output encoding techniques can help prevent security issues. It is also important to ensure that the script follows best practices and coding standards to maintain functionality and readability. 

// Example code snippet for input validation and output encoding

// Input validation
$user_input = $_POST['user_input'];
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Output encoding
echo htmlspecialchars($clean_input);

Keywords

security audit code review input validation SQL injection cross-site scripting

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