original_string: public function exists($key) {
  		return isset($this->_data[$key]) || isset($this->registered[$key]);
  	}
code: public function exists($key) {
  		return isset($this->_data[$key]) || isset($this->registered[$key]);
  	}
code_tokens: public function exists ( $ key ) { return isset ( $ this -> _data [ $ key ] ) || isset ( $ this -> registered [ $ key ] ) ; }
docstring: Checks whether an key can be resolved to an object or registered closure.
  
  @param string $key Item key.
  
  @return boolean True if the item can be resolved to an object.
docstring_tokens: Checks whether an key can be resolved to an object or registered closure .