How can PHP developers ensure the security of their code, especially when handling user input?

PHP developers can ensure the security of their code, especially when handling user input, by using input validation and sanitization techniques. This involves checking and filtering user input to prevent malicious code injections, such as SQL injection or cross-site scripting attacks. Additionally, developers should use prepared statements when interacting with databases to prevent SQL injection vulnerabilities. 

// Example of input validation and sanitization using filter_var
$user_input = $_POST['user_input'];

// Validate and sanitize user input
$filtered_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Use the sanitized input in your application
echo "User input: " . $filtered_input;

Keywords

SQL injection cross-site scripting (XSS) input validation prepared statements password hashing

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