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Simple examples of Design Patterns with PHP Examples
Design patterns implemented using traits in PHP 5.4
All Design Patterns Samples in PHP
Most simplest design pattern implementation in PHP, including all 23 GoF patterns plus some other patterns
Design Pattern Examples in PHP
Mastering PHP Design Patterns by Packt
good idea to follow common patterns because it will make your code easier to manage and easier for others to understand
Some Design Pattern implemented in PHP