public function getTraceAsString() {
		$lines = array ();
		for( $i = 0; $i < count($this->trace); $i++ ){
			$a = $this->trace[$i];
			$call = "{$a['function']}()";
			if( isset($a['class']) ){
				$call = "{$a['class']}{$a['type']}$call";
			}
			$lines[] = "#$i {$a['file']}({$a['line']}): $call";
		} 
		$lines[] = "#$i {main}";
		return implode( "\n", $lines );
	}