How can PHP developers ensure that their code is safe and secure, even when used locally?

PHP developers can ensure that their code is safe and secure, even when used locally, by following best practices such as input validation, using secure coding techniques, and implementing proper error handling. They should also regularly update their PHP version and libraries to patch any security vulnerabilities. 

// Example code snippet for input validation
$input = $_POST['user_input'];
if (preg_match("/^[a-zA-Z0-9]+$/", $input)) {
    // Proceed with safe processing
} else {
    // Handle invalid input
}

Keywords

SQL injection cross-site scripting input validation secure coding practices password hashing

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