Introduction to php's simple cache full-site functions

Php & nbsp; brief introduction to cache full-site functions & lt ;? Phpfunctioncache_page ($ refresh20) {ob_start (); // enable the buffer $ hashsha1 ($ _ SERVER [PHP_SELF]. | G |. serialize ($ _ GET ). | P |. serialize ($ _ POST); // cache file name $ f Introduction to php simple cache full-site functions

2. Function cache_page ($ refresh = 20 ){
3. Ob_start (); // enable the buffer
4. $ Hash = sha1 ($ _ SERVER [PHP_SELF]. | G |. serialize ($ _ GET). | P |. serialize ($ _ POST); // cache file name
5. $ File = dirname (_ FILE _)./cache/. $ hash; // cache file path
6. If (! File_exists ($ file) {// The cached file does not exist
7. Register_shutdown_function (cache_page_go, $ file );
8. } Else {// The cached file exists
9. If (time ()-filemtime ($ file)> $ refresh) {// cache timeout
10. Register_shutdown_function (cache_page_go, $ file); // call a function
11. }
12. Else {// cache file for normal use
13. $ F = file_get_contents ($ file); // retrieves the cached file content
14. Echo $ f. cached content. // outputs the cached content.
15. $ Output = ob_get_contents (); // retrieves the buffer content
16. Ob_get_clean (); // clear the buffer
17. Echo $ output; // output
18. Exit ();
19. }
20. }
21. }
23. Function cache_page_go ($ file ){
24. $ Output = ob_get_contents (); // Obtain the buffer content
25. Ob_get_clean (); // clear the buffer
26. File_put_contents ($ file, $ output, LOCK_EX); // write the cached file
27. Echo $ output. newly created. // outputs the cached content.
28. Exit ();
29. }
30. ?>