<?php
/**
* 用于获取远程文件并缓存
* CurlCache v1.0
* Created by cr.
* Date: 2015/12/03
*/
//namespace vendor\core;
class CurlCache
{
/**
* 请求地址
* @var string
*/
protected $url;
/**
* 缓存生存期
* @var int
*/
protected $expires;
/**
* 请求超时
* @var int
*/
protected $timeOut;
/**
* 是否开启缓存
* @var int
*/
protected $cacheEna;
/**
* 是否显示debug信息
* @var bool
*/
protected $debug;
/**
* 其他不用配置的内部属性
*/
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;
}
/**
* 检测并创建目录
* @return bool
*/
public function mkdirs(){
if(is_dir($this->path)){
return true;
}else{
return mkdir($this->path, 777, true);
}
}
/**
* 设置缓存文件相关信息
* @param $url
*/
public function setCacheFileInfo($url){
$this->url=$url;
$this->path=dirname(__FILE__).'/cache/';
$this->filename=$this->url?md5($this->url):'null';
}
/**
* 主方法,取得数据
* @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 请求数据
* @param $url
* @return string
*/
public function curlGet($url){
if($this->debug && $url=='') echo('请求URL为空,请检查');
$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['http_code'] != '200') && $this->debug ) echo '请求失败,错误信息:'.$this->curlError;
else return $return;
}
/**
* 取得缓存数据
* @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 '缓存文件已过期';
if($this->cacheData) return $this->cacheData;else if($this->debug) echo '缓存文件内容为空';
}else{
//if($this->debug) echo '缓存文件不存在';
return false;
}
}
/**
* 写入缓存数据
* @param $url
* @param $data
*/
public function setCache($url,$data){
$this->setCacheFileInfo($url);
if(!$this->mkdirs() && $this->debug) echo('创建缓存目录失败:'.$this->path);
if($data){
if(!file_put_contents($this->path.$this->filename,$data) && $this->debug){
echo '写入缓存失败 File:'.$this->path.$this->filename;
}
}else{
if($this->debug) echo '数据为空,不写入缓存';
}
}
}
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