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PHP cache file cache
Home Backend Development PHP Tutorial PHP cache file cache_PHP tutorial

PHP cache file cache_PHP tutorial

Jul 13, 2016 am 10:19 AM
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PHP cache file cache

1. PHP file cache content saving format
There are three main formats for saving PHP file cache content:
(1) The variable var_export is formatted into PHP’s normal assignment writing format;
(2) The variable serialize is saved after serialization and deserialized when used;
(3) The variable json_encode is formatted and saved. When used, json_decode
The test results on the Internet are: the file parsing efficiency in serialize format is greater than Json, and the parsing efficiency of Json is greater than PHP normal assignment.
Therefore, if we cache data, it is recommended to use serialization to parse the data faster.

2. Simple case of PHP file caching

<?php
class Cache_Driver{
	//定義緩存的路徑
	protected $_cache_path;

//根據(jù)$config中的cache_path值獲取路徑信息
	public function Cache_Driver($config)
	{
		if(is_array($config) && isset($config[&#39;cache_path&#39;]))
		{
		   $this->_cache_path = $config[&#39;cache_path&#39;];
		}
		else
		{
		   $this->_cache_path = realpath(dirname(__FILE__)."/")."/cache/";
		}
	}
//判斷key值對(duì)應(yīng)的文件是否存在,如果存在,讀取value值,value以序列化存儲(chǔ)
	public function get($id)
	{
		if ( ! file_exists($this->_cache_path.$id))
		{
			return FALSE;
		}
		
		$data = @file_get_contents($this->_cache_path.$id);
		$data = unserialize($data);
		
		if(!is_array($data) || !isset($data[&#39;time&#39;]) || !isset($data[&#39;ttl&#39;]))
		{
			return FALSE;
		}
		
		if ($data[&#39;ttl&#39;] > 0 && time() >  $data[&#39;time&#39;] + $data[&#39;ttl&#39;])
		{
			@unlink($this->_cache_path.$id);
			return FALSE;
		}
		
		return $data[&#39;data&#39;];
	}
//設(shè)置緩存信息,根據(jù)key值,生成相應(yīng)的緩存文件
	public function set($id, $data, $ttl = 60)
	{		
		$contents = array(
				&#39;time&#39;		=> time(),
				&#39;ttl&#39;		=> $ttl,			
				&#39;data&#39;		=> $data
			);
		
		if (@file_put_contents($this->_cache_path.$id, serialize($contents)))
		{
			@chmod($this->_cache_path.$id, 0777);
			return TRUE;			
		}

		return FALSE;
	}
//根據(jù)key值,刪除緩存文件
	public function delete($id)
	{
		return @unlink($this->_cache_path.$id);
	}

	public function clean()
	{
      $dh = @opendir($this->_cache_path);
	   if(!$dh)
         return FALSE;
      
      while ($file = @readdir($dh))
      {
         if($file == "." || $file == "..")
            continue;
         
         $path = $this->_cache_path."/".$file;
         if(is_file($path))
            @unlink($path);
      }
      @closedir($dh);
      
		return TRUE;
	}
}


www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/871195.htmlTechArticlePHP cache file cache 1. PHP file cache content saving method There are three main ways to save PHP file cache content: ( 1) The variable var_export is formatted into the normal PHP assignment format; (2) Variable...
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