PHP simple caching site-wide function introduction_PHP tutorial

php Simple cache site-wide function introduction

2. function cache_page($refresh=20){
3. ob_start();//Open 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($file)) {// The cache file does not exist
7. register_shutdown_function(cache_page_go,$file);
8. }else{// The cache file exists
9. if( (time()-filemtime($file) )>$refresh ){//Cache timeout
10. register_shutdown_function(cache_page_go,$file);//Call function
11. }
12. else{//Use cache file normally
13. $f=file_get_contents($file);// Get cached file content
14. echo $f. Cached;//Output cached content
15. $output=ob_get_contents (); //Get 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. $output=ob_get_contents(); //Get buffer contents
25. ob_get_clean(); //Clear buffer
26. file_put_contents($file,$output,LOCK_EX);//Write cache file
27. echo $output. Newly created;//Output cache content
28. exit();
29. }
30. ?>

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