Share a simple cache class in PHP
This article shares with you an extremely simple PHP caching code. The application of caching is particularly important for the development of PHP projects. Friends in need can refer to it. I hope to be helpful.
There is a lot of information about the PHP cache class on the Internet, but this class should be the one I have seen that has functions that meet the needs but is extremely simple. Without further ado, let’s just look at the code!
Instructions for use:
1. Instantiation
$cache = new Cache();
2. Set cache time and cache directory
$cache = new Cache(60, '/any_other_path/');
The first parameter is the cache seconds, the second parameter is the cache path, configure it as needed .
By default, the cache time is 3600 seconds, and the cache directory is cache/
3. Read cache
$value = $cache->get ('data_key');
4. Write cache
$value = $cache->put('data_key', 'data_value');
Complete example:
$cache = new Cache();
//从缓存从读取键值 $key 的数据
$values = $cache->get($key);
//如果没有缓存数据
if ($values == false) {
//insert code here...
//写入键值 $key 的数据
$cache->put($key, $values);
} else {
//insert code here...
}Cache.class.php
<?php
class Cache {
private $cache_path;//path for the cache
private $cache_expire;//seconds that the cache expires
//cache constructor, optional expiring time and cache path
public function Cache($exp_time=3600,$path="cache/"){
$this->cache_expire=$exp_time;
$this->cache_path=$path;
}
//returns the filename for the cache
private function fileName($key){
return $this->cache_path.md5($key);
}
//creates new cache files with the given data, $key== name of the cache, data the info/values to store
public function put($key, $data){
$values = serialize($data);
$filename = $this->fileName($key);
$file = fopen($filename, 'w');
if ($file){//able to create the file
fwrite($file, $values);
fclose($file);
}
else return false;
}
//returns cache for the given key
public function get($key){
$filename = $this->fileName($key);
if (!file_exists($filename) || !is_readable($filename)){//can't read the cache
return false;
}
if ( time() < (filemtime($filename) + $this->cache_expire) ) {//cache for the key not expired
$file = fopen($filename, "r");// read data file
if ($file){//able to open the file
$data = fread($file, filesize($filename));
fclose($file);
return unserialize($data);//return the values
}
else return false;
}
else return false;//was expired you need to create new
}
}
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