<?php
/**
 * 用于獲取遠(yuǎn)程文件并緩存
 * CurlCache v1.0
 * Created by cr.
 * Date: 2015/12/03
 */
 
//namespace vendor\core;
 
 
class CurlCache
{
    /**
     * 請(qǐng)求地址
     * @var string
     */
    protected $url;
 
    /**
     * 緩存生存期
     * @var int
     */
    protected $expires;
 
    /**
     * 請(qǐng)求超時(shí)
     * @var int
     */
    protected $timeOut;
 
    /**
     * 是否開(kāi)啟緩存
     * @var int
     */
    protected $cacheEna;
 
    /**
     * 是否顯示debug信息
     * @var bool
     */
    protected $debug;
 
    /**
     * 其他不用配置的內(nèi)部屬性
     */
    protected $path;
 
    protected $filename;
 
    protected $curlData;
 
    protected $curlHeader;
 
    protected $curlError;
 
    protected $cacheData;
 
    public $data;
    /**
     * CurlCache constructor.
     * @param int $expires
     * @param int $timeOut
     * @param bool|true $cacheEna
     * @param bool|false $debug
     */
    public function __construct($expires=3600, $timeOut=30, $cacheEna=true, $debug=false)
    {
        $this->expires=$expires;
        $this->timeOut=$timeOut;
        $this->cacheEna=$cacheEna;
        $this->debug=$debug;
    }
 
    /**
     * 檢測(cè)并創(chuàng)建目錄
     * @return bool
     */
    public function mkdirs(){
        if(is_dir($this->path)){
            return true;
        }else{
            return mkdir($this->path, 777, true);
        }
    }
 
    /**
     * 設(shè)置緩存文件相關(guān)信息
     * @param $url
     */
    public function setCacheFileInfo($url){
        $this->url=$url;
        $this->path=dirname(__FILE__).&#39;/cache/&#39;;
        $this->filename=$this->url?md5($this->url):&#39;null&#39;;
    }
 
    /**
     * 主方法，取得數(shù)據(jù)
     * @param $url
     * @return bool|string
     */
    public function get($url){
        $this->setCacheFileInfo($url);
        if($this->cacheEna) $this->data=unserialize($this->getCache($url));
        if(!$this->data) $this->data=$this->curlGet($url);
        if($this->data && $this->cacheEna) $this->setCache($url,serialize($this->data));
        return $this->data->contents;
    }
 
    /**
     * curl GET 請(qǐng)求數(shù)據(jù)
     * @param $url
     * @return string
     */
    public function curlGet($url){
        if($this->debug && $url==&#39;&#39;) echo(&#39;請(qǐng)求URL為空，請(qǐng)檢查&#39;);
        $return=new stdClass();
        $ch = curl_init ();
        curl_setopt($ch, CURLOPT_URL,$url );
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeOut);
        curl_setopt($ch, CURLOPT_HEADER, 0 );
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        $this->curlData=curl_exec($ch);
        $this->curlHeader=curl_getinfo($ch);
        $this->curlError=curl_error($ch);
        $return->header=$this->curlHeader;
        $return->contents=$this->curlData;
        curl_close($ch);
        if((!$this->curlData || $this->curlHeader[&#39;http_code&#39;] != &#39;200&#39;) && $this->debug ) echo &#39;請(qǐng)求失敗，錯(cuò)誤信息：&#39;.$this->curlError;
        else return $return;
    }
 
    /**
     * 取得緩存數(shù)據(jù)
     * @param $url
     * @return bool|string
     */
    public function getCache($url){
        $this->setCacheFileInfo($url);
        if(file_exists($this->path.$this->filename)){
            if(time() - filemtime($this->path.$this->filename) < $this->expires) $this->cacheData=file_get_contents($this->path.$this->filename);
            else if($this->debug) echo &#39;緩存文件已過(guò)期&#39;;
            if($this->cacheData) return $this->cacheData;else if($this->debug) echo &#39;緩存文件內(nèi)容為空&#39;;
        }else{
            //if($this->debug) echo &#39;緩存文件不存在&#39;;
            return false;
        }
    }
 
    /**
     * 寫(xiě)入緩存數(shù)據(jù)
     * @param $url
     * @param $data
     */
    public function setCache($url,$data){
        $this->setCacheFileInfo($url);
        if(!$this->mkdirs() && $this->debug) echo(&#39;創(chuàng)建緩存目錄失敗:&#39;.$this->path);
        if($data){
            if(!file_put_contents($this->path.$this->filename,$data) && $this->debug){
                echo &#39;寫(xiě)入緩存失敗 File:&#39;.$this->path.$this->filename;
            }
        }else{
            if($this->debug) echo &#39;數(shù)據(jù)為空，不寫(xiě)入緩存&#39;;
        }
    }
 
 
 
}