Best PHP programming Books

If you are looking for Books about PHP Programming to advance your Knowledge, here is the best  list in various formats available for free :

• CakePHP Framework
  • CakePHP Cookbook 2.x (PDF)
• CodeIgniter Framework
  • CodeIgniter 2.2.6
  • CodeIgniter 3.1.6
• Drupal Framework
  • Drupal 7
    • The Tiny Book of Rules (PDF)
• Laravel Framework
  • Laravel 3
    • Laravel: Code Happy – Dayle Rees
  • Laravel 4
    • Laravel: Code Bright – Dayle Rees
  • Laravel 5
    • Laravel 5.x Official Documentation. Synced Daily (Leanpub account or valid email requested)
    • Laravel Best Practices
    • Laravel: Code Smart – Dayle Rees
    • Laravel Collections Unraveled – Jeffrey Madsen (Leanpub account or valid email requested)
• PHP 5 Power Programming (PDF)
• PHP Best Practices
• PHP Internals Book
• PHP Pandas – Dayle Rees
• PHP Programming – Wikibooks
• PHP Security Guide
• PHP: The Right Way
• PHPUnit Manual – Sebastian Bergmann (PDF)
• Practical PHP Programming
• Practical PHP Testing
• Survive The Deep End: PHP Security
• Symfony Framework
  • Symfony 2.8
    • The Symfony Book 2.8.x (PDF)
  • Symfony 3.4
    • The Symfony Best practices 3.4.x (PDF)
    • The Symfony Book 3.4.x
    • The Symfony Getting started 3.4.x (PDF)
  • Symfony 4.1
    • The Symfony Best practices 4.1.x (PDF)
    • The Symfony Book 4.1.x
    • The Symfony Getting started 4.1.x (PDF)
• Using Libsodium in PHP Projects
• Zend Framework
  • Using Zend Framework 3