Detailed graphic and text explanation of how PHP uses text to count visits

This article mainly introduces the method of using text to count visits in PHP, involving techniques related to reading and writing PHP text files and numerical operations. Friends in need can refer to the following

Method 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);

Method 2:

counter.php file:

Usage:

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