PHP Database Cache: PHP File cache data

When doing a look at the Internet café, because the page has a movie search function (user input)
This function can not be made static, then only dynamic, with the dynamic of the database, server pressure will bring a great test
So there's only a way to cache the data.
The forms of data caching include:
1, the data cache to memory, I believe everyone this will think of Memcached.memcached is a high-performance distributed memory cache server. The purpose of the general use is to reduce the number of database visits by caching database query results to improve the speed and scalability of dynamic Web applications.
2, the use of files to cache data. Save the data to a file, save it in key=>value form, key refers to the filename. This place has to be a guarantee of key uniqueness.
Set the cache time for the file, and if it is obsolete, get the data from the database and save it to a file.
The following is a file caching class:
1. Cache data
2. Get the data
3, to determine whether the cache data exist
4. Delete a cached data
5. Erase obsolete Cached data
6, clear the cached data
Class inc_filecache{
Private $cacheTime = 3600; Default Cache time
Private $cacheDir = Cache_dir; Cache absolute Path
Private $MD 5 = true; Whether to encrypt keys
Private $suffix = ". php"; Set file suffix
Public function __construct ($config) {
if (Is_array ($config)) {
foreach ($config as $key => $val) {
$this-> $key = $val;
}
}
}
Setting up caching
Public function set ($key, $val, $leftTime =null) {
$key = $this->md5? MD5 ($key): $key;
$leftTime = $leftTime? $leftTime: $this->cachetime;
!file_exists ($this->cachedir) && mkdir ($this->cachedir,0777);
$file = $this->cachedir. ' /'. $key. $this->suffix;
$val = serialize ($val);
@file_put_contents ($file, $val) or $this->error (__line__, "file write Failed");
@chmod ($file, 0777) or $this->error (__line__, "Set file permissions failed");
@touch ($file, Time () + $leftTime) or $this->error (__line__, "Change file times failed");
}
Get Cached
Public function Get ($key) {
$this->clear ();
if ($this->_isset ($key)) {
$key _md5 = $this->md5? MD5 ($key): $key;
$file = $this->cachedir. ' /'. $key _md5. $this->suffix;
$val = file_get_contents ($file); This article links http://www.cxybl.com/html/wlbc/Php/20121222/35116.html