PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.
Support for authenticating users using both OAuth1.0a and OAuth2 in Symfony2.
PHP 5.3+ Fully-featured Authentication & Authorization System
Permission handling for Laravel 5.1 and up
Symfony Security Component
PHP 5.3+ oAuth 1/2 Library
Prevents installation of composer packages with known security vulnerabilities: no API, simply require it
? Latte: the intuitive and fast template engine for those who want the most secure PHP sites. Introduces context-sensitive escaping.
Secure PHP Encryption Library
A scanner to evaluate php.ini security
A security checker for your composer.lock
Laravel 5 Captcha Package
Enhances the Symfony2 Security Component by adding several new features
PHP 5.4+ Fully-featured Authentication & Authorization System
Laravel 5 HtmlPurifier Package
Extra security-related features for Symfony: signed/encrypted cookies, HTTPS/SSL/HSTS handling, cookie session storage, ...
A flexible, driver based Acl package for PHP 5.4+
PHPIDS (PHP-Intrusion Detection System) is a simple to use, well structured, fast and state-of-the-art security layer for your PHP based web application
PHP Password Library: Easy, secure password management for PHP
Light-weight role-based permissions for Laravel 5 built in Auth system.
A PHP security library
PHP CAPTCHA Library