code: function setIdentifiers($ident) {
  		if (is_array($ident)) {
  			$this->identifiers = array_fill_keys(array_values($ident), true);
  			$this->buildCharMap();
  		} else {
  			$this->setIdentifiers(str_split($ident));
  		}
  	}
docs: Sets characters to be recognized as identifier
  
  Used like: setIdentifiers('ab') or setIdentifiers(array('a' => true, 'b', 'c'));
  @param string|array $ident
  @see getIdentifiers();