程序独占该文件，不允许其他操作，直到该程序完成对文件的操作 1 $content = '2 asdfasdfasdf3 asdfasdfasdf4 asdfasdfasd5 asdfasdf6 asdfasdf7 ';
1 $file = '/var/www/file.txt';
1 $fp = @fopen($file, 'wb') ;2 if(@feof($file)) return; 3 flock($fp, LOCK_EX); 4 $len = @fwrite($fp, $content); 5 flock($fp, LOCK_UN); 6 @fclose($fp); 7 exec("chmod 777 $file");