code: public function set($name,$value=null,$overwrite=true){
  		if(is_array($name)){
  			$overwrite = $value;
  			foreach($name as $key => $val) $this->set($key,$val,$overwrite);
  			return true;
  		}
  		if(isset($this->constants[$name]) && $overwrite === false) return false;
  		$this->constants[$name] = $value;
  		return true;
  	}
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