一个简单的 PHP 访问计数器

2. // start at the top of the page since we start a session
3. session_name('mysite_hit_counter');
4. session_start();
5. //
6. $fn = 'hits_counter.txt';
7. $hits = 0;
8. // read current hits
9. if (($hits = file_get_contents($fn)) === false)
10. {
11. $hits = 0;
12. }
13. // write one more hit
14. if (!isset($_SESSION['page_visited_already']))
15. {
16. if (($fp = @fopen($fn, 'w')) !== false)
17. {
18. if (flock($fp, LOCK_EX))
19. {
20. $hits++;
21. fwrite($fp, $hits, strlen($hits));
22. flock($fp, LOCK_UN);
23. $_SESSION['page_visited_already'] = 1;
24. }
25. fclose($fp);
26. }
27. }
28. ?>

36. Page content...

38. This page has =$hits;?> hits

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