Develop Android server using php to create dynamic cache_PHP tutorial

Developing Android server using php to create dynamic cache

Why there is a cache: Reduce database server pressure.
1. Static cache:
Static files saved on the server disk, use PHP to generate data and put them in the static files
php operation cache:
1. Generate cache
2. Get cache

3. Delete cache

Generate cache file:

file.php operates static cache classes

<?php

class File {//操作静态缓存的业务
	private $_dir;

	const EXT = &#39;.txt&#39;;

	public function __construct() {
		//获取文件当前目录，把缓存文件放到当前目录files下
		$this->_dir = dirname(__FILE__) . &#39;/files/&#39;;
	}
	//key是缓存文件文件名，value是缓存数据
	public function cacheData($key, $value = &#39;&#39;, $path=&#39;&#39;) {
		$filename = $this->_dir . $path . $key . self::EXT;

		if($value !== &#39;&#39;) { // 将value值写入缓存
			 
			 //获取目录，判断如果目录不存在，创建目录
			$dir = dirname($filename);
			if(!is_dir($dir)) {
				mkdir($dir, 0777);//生成目录，给出权限
			}
			//第一个参数文件名，第二个数据（String）,把数组vlaue转换成字符串
			return file_put_contents($filename,json_encode($value));
		}
		
	}
}

testfile.php

<?php
require_once(&#39;./file.php&#39;);
$data=array(
&#39;id&#39;=>1,
&#39;name&#39;=>&#39;david&#39;,
&#39;type&#39;=>array(4,5,6)
);
$file=new File();
if($file->cacheData(&#39;davidcache&#39;,$data)){
echo "success";}else{
echo "error";
}

If the generation is successful, success

will be displayed.

This creates a cache file named davidchche.txt in the file directory of the current file directory.

Advanced version: also implements cache reading and deletion

file.php

<?php

class File {//操作静态缓存的业务
	private $_dir;
	const EXT = &#39;.txt&#39;;
	public function __construct() {
		//获取文件当前目录，把缓存文件放到当前目录files下
		$this->_dir = dirname(__FILE__) . &#39;/files/&#39;;
	}
	//key是缓存文件文件名，value是缓存数据
	public function cacheData($key, $value = &#39;&#39;, $path=&#39;&#39;) {
		$filename = $this->_dir . $path . $key . self::EXT;

		if($value !== &#39;&#39;) { // 将value值写入缓存
			 
             if(is_null($value)) {//如果value值穿null则删除这个缓存文件
				return @unlink($filename);
			}
			 //获取目录，判断如果目录不存在，创建目录
			$dir = dirname($filename);
			if(!is_dir($dir)) {
				mkdir($dir, 0777);//生成目录，给出权限
			}
			//第一个参数文件名，第二个数据（String）,把数组vlaue转换成字符串
			return file_put_contents($filename,json_encode($value));
		}

		if(!is_file($filename))//读取缓存文件
		{
			return FALSE;
		}else{
            return json_decode(file_get_contents($filename),true);
		}
		
	}
}

According to the file class, if value is empty='', read cached data,
If value is null, delete cached data,
If value is not empty or null, create cache data

testfile.php

<?php
require_once(&#39;./file.php&#39;);
$data=array(
&#39;id&#39;=>1,
&#39;name&#39;=>&#39;david&#39;,
&#39;type&#39;=>array(4,5,6)
);
$file=new File();
//删除缓存文件
if($file->cacheData(&#39;davidcache&#39;,null)){
	//if($file->cacheData(&#39;davidcache&#39;)){
	//var_dump($file->cacheData(&#39;davidcache&#39;));
	//exit;
echo "success";}else{
echo "error";
}
    /*下面这个是读取缓存时使用的
	if($file->cacheData(&#39;davidcache&#39;)){
	var_dump($file->cacheData(&#39;davidcache&#39;));
	exit;
echo "success";}else{
echo "error";
}*/

/*下面这个是创建缓存调用的
if($file->cacheData(&#39;davidcache&#39;,$data)){
echo "success";}else{
echo "error";
}*/

//根据file类，如果value为空=&#39;&#39;，读取缓存数据，
//如果value为null,删除缓存数据，
//如果value不为空，也不是null，那么创建缓存数据

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