original_string: public function layerEffect(String $effect = 'normal') : GD
      {
          imagelayereffect($this->canvas, Helper::toConstant($effect, 'IMG_EFFECT_'));
  
          return $this;
      }
code: public function layerEffect(String $effect = 'normal') : GD
      {
          imagelayereffect($this->canvas, Helper::toConstant($effect, 'IMG_EFFECT_'));
  
          return $this;
      }
code_tokens: public function layerEffect ( String $ effect = 'normal' ) : GD { imagelayereffect ( $ this -> canvas , Helper :: toConstant ( $ effect , 'IMG_EFFECT_' ) ) ; return $ this ; }
docstring: Set layer effect
  
  @param string $effect = 'normal'
  
  @return GD
docstring_tokens: Set layer effect