What resources or guidelines are available for PHP developers to improve the security of their web applications?

PHP developers can improve the security of their web applications by following best practices such as input validation, using parameterized queries to prevent SQL injection, implementing proper authentication and authorization mechanisms, and regularly updating PHP and other dependencies to patch security vulnerabilities. 

// Example of input validation to prevent SQL injection
$user_input = $_POST['user_input'];
$clean_input = mysqli_real_escape_string($connection, $user_input);
$query = "SELECT * FROM users WHERE username='$clean_input'";
$result = mysqli_query($connection, $query);

Keywords

OWASP PHP security XSS CSRF SQL injection

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