Question

我正在寻找一些关于缓存 php 的信息。所有我找到的信息都是在一定的时间间隔( 每几个小时) 缓存一个 php 文件。是否有办法为每50 个页面视图缓存。每50 个页面视图后, 缓存文件将过期。

有谁知道吗?

提前感谢您!

Answer 1

这里的解决方案 i 组合在一起, 而不是使用基于文件的缓存, 而是使用数据库, PDO sqlite (这样就很容易删除缓存文件数据库, 以清除所有缓存 ) 。

向底部看您可以看到它是如何运作的, 它在50次点击后将删除行并重定向, 这样它就可以生成新副本。希望它能帮助您。

< 坚固> qqlite.cache. class.php

<?php 
/**
* PDO sqlite cache class
* You can include( sqlite.cache.class.php ); this class
*/
class sqlite_cache{
    private $db;

    function __construct($dsn){
        $this->dsn = $dsn;
        $this->chkSetup();
    }

    /*Singleton Connect*/
    private function connect(){
        if (!$this->db instanceof PDO){
            $this->db = new PDO($this->dsn);
            $this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        }
    }

    /*Raw Select*/
    public function rawSelect($sql){
        $this->connect();
        return $this->db->query($sql)->fetchAll(PDO::FETCH_ASSOC);
    }

    public function get($fieldname=null, $id=null){
        $this->connect();
        $sql = "SELECT * FROM cache WHERE $fieldname = :id";
        $statement = $this->db->prepare($sql);
        $statement->bindParam( :id , $id, PDO::PARAM_STR);
        $statement->execute();
        return $statement->fetchAll(PDO::FETCH_ASSOC);
    }

    /*Insert*/
    public function put($values){
        $this->connect();
        $fieldnames = array_keys($values[0]);
        $sql = "INSERT INTO cache ";
        $fields =  ( .implode(  , , $fieldnames). ) ;
        $bound =  (: .implode( , : , $fieldnames). ) ;
        $sql .= $fields.  VALUES  .$bound;

        $statement = $this->db->prepare($sql);
        foreach($values as $vals){
            $statement->execute($vals);
        }
    }

    /*Update*/
    public function update($fieldname, $value, $pk, $id){
        $this->connect();
        $sql = "UPDATE cache SET $fieldname = :value WHERE $pk = :id";
        $statement = $this->db->prepare($sql);
        $statement->bindParam( :id , $id, PDO::PARAM_STR);
        $statement->bindParam( :value , $value, PDO::PARAM_STR);
        $statement->execute();
    }

    /*Update Hits*/
    public function add_hit($id){
        $this->connect();
        $sql = "UPDATE cache SET hits = hits + 1 WHERE url = :id";
        $statement = $this->db->prepare($sql);
        $statement->bindParam( :id , $id, PDO::PARAM_STR);
        $statement->execute();
    }

    /*Delete*/
    public function delete($id){
        $this->connect();
        $sql = "DELETE FROM cache WHERE url = :id";
        $statement = $this->db->prepare($sql);
        $statement->bindParam( :id , $id, PDO::PARAM_STR);
        $statement->execute();
    }


    /*Database Setup*/
    private function chkSetup(){
        $dso = explode( : ,$this->dsn);

        if(file_exists($dso[1])){
            return;
        }else{
            $this->connect();
            //Create Table
            $sql ="CREATE TABLE cache (id INTEGER PRIMARY KEY,
                                            title TEXT,
                                            url TEXT,
                                            hits INTEGER,
                                            date INTEGER,
                                            contents TEXT)";
            $this->db->query($sql);
            header("refresh:0;url=./");
            die;
        }
    }
}
?>

<强度 > index.php

<?php
include( sqlite.cache.class.php );
$cache = new sqlite_cache( sqlite:./cache.db );

//Check if cache exists
$cache_result = $cache->get( url ,$_SERVER[ REQUEST_URI ]);
//Exists
if(!empty($cache_result)){
    //Add Hit
    $cache->add_hit($_SERVER[ REQUEST_URI ]);

    //Delete If over 50 hits
    if($cache_result[0][ hits ]>=50){
        $cache->delete($_SERVER[ REQUEST_URI ]);
        header( Location:  .$_SERVER[ REQUEST_URI ]);
        die;
    }

    echo $cache_result[0][ contents ];
}else{
    //Generate your page contents ect
    ob_start();

    ///////////////////////////////
    //Your script code goes here
    ///////////////////////////////

    echo  Your content ;

    //End your script code/////////
    ///////////////////////////////
    $return = ob_get_contents();
    ob_end_clean();

    //Before output build values to put in cache
    $cache_contents = array(array( id =>NULL,
                                   title => Page Title ,
                                   url =>$_SERVER[ REQUEST_URI ],
                                   hits => 0 ,
                                   date =>time(),
                                   contents =>$return));

    //Store cache
    $cache->put($cache_contents);
    echo $return;
}

?>

Answer 2

你可以去非常低的技术找到解决这个问题的办法。

每次点击您的 URL 时, 您可以创建一个临时文件作为计数器。使用类似方式- NAME OF TRANSLATORS - NAME OF TRANSLATORS

// recursively remove a directory
function rrmdir($dir) {
    foreach(glob($dir .  /* ) as $file) {
        if ($file != "." && $file != "..") {
          if(is_dir($file))
            rrmdir($file);
          else
            unlink($file);
        }
    }
    rmdir($dir);
} 



$fileCount = count(glob($tempfile_directory."/*"));
if ($fileCount >= $someLimit){
  rrmdir($tempfile_directory); // clear the counter
  mkdir($tempfile_directory);
  // clear the cached server data and refresh. 
}
touch($tempfile_directory .  /  . time()); // create a new dummy counter file

从 < a href=> 中借用的递归删除功能 http://www.php.net/manual/en/conform.rmdir.php#108113

当 $tempfile_ directory 中的文件数量大于或等于 $someLimit 时,文件夹将被清空,并更新缓存数据。

友情链接