php统计文件中的代码行数

public function totalByFile($fullFileName) {
 $fileContent = file_get_contents($fullFileName);
 $lines = explode("
", $fileContent);
 $lineCount = count($lines);
 
 for($i = $lineCount -1; $i > 0; $i -= 1) {
 $line = $lines[$i];
 if ($line != "") break;
 $lineCount -= 1; //最后几行是空行的要去掉。
 }
 unset($fileContent);
 unset($lines);
 
 $totalCodeInfo = new TotalCodeInfo();
 $totalCodeInfo->setFileCount(1);
 $totalCodeInfo->setLineCount($lineCount);
 return $totalCodeInfo;
 }