How to implement a decorator in PHP?

Question

Suppose there is a class called \"Class_A\", it has a member function called \"func\".

I want the \"func\" to do some extra w

Answer 1

I wanted to use decoration to encourage colleagues to use caching more, and inspired by the nice Python syntax experimented with PHP reflection to fake this language feature (and I have to stress 'fake'). It was a useful approach. Here's an example:

class MrClass { 
  /**
   * decoratorname-paramname: 50
   * decoratorname-paramname2: 30
   */
   public function a_method( $args ) {
     // do some stuff
   }
}


class DecoratorClass {
  public function __construct( $obj ) {
     $this->obj = $obj;
     $this->refl = new ReflectionClass( $obj );
  }
  public function __call( $name, $args ) {
    $method = $this->refl->getMethod( $name );
    // get method's doccomment
    $com = trim( $method->getDocComment() );
    // extract decorator params from $com
    $ret = call_user_func_array( array( $this->obj, $name), $args );
    // perhaps modify $ret based on things found in $com
    return $ret;
}

Better examples with caching examples here: https://github.com/gamernetwork/EggCup