- $backtrace .= "<span class=\"backtrace_file\">".basename($trace['file'])."</span>:".$trace['line'].", <span class=\"backtrace_function\">".$trace['function']."(".count($trace['args']).")</span><br />";
+ $backtrace .= sprintf("<span class=\"backtrace_file\">%s</span>:%d, <span class=\"backtrace_function\">%s(%d)</span><br />\n",
+ basename($trace['file']),
+ $trace['line'],
+ $trace['function'],
+ count($trace['args'])
+ );