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            本文实例讲述了php使用文本统计访问量的方法。分享给大家供大家参考,具体如下: 
方法1: 
$fp = fopen("counter.txt", "r+"); 
while(!flock($fp, LOCK_EX)) { // acquire an exclusive lock 
  // waiting to lock the file 
} 
$counter = intval(fread($fp, filesize("counter.txt"))); 
$counter++; 
ftruncate($fp, 0);   // truncate file 
fwrite($fp, $counter); // set your data 
fflush($fp);      // flush output before releasing the lock 
flock($fp, LOCK_UN);  // release the lock 
fclose($fp); 
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