php - 简单的 PHP/cURL 缓存

Question

我正在通过 cURL 获取远程页面的内容，我想缓存该页面，以便下次该页面不请求 cURL，并从缓存中加载。

缓存应该在一周内过期。

Answer 1

一些伪代码。

make a temp folder 


before each request check if page exists(with name==hash of URL) in the temp folder,  
if not,  
  fetch the page, 
  hash the URL,  
  save page in temp with the Hashed url file name.
else if exists
  get the temp file content
return contents

更新:代码::

$curl_defaults = array(
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HEADER => 0,
    CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 5.1; rv:2.0b11) Gecko/20100101 Firefox/4.0b11',
    CURLOPT_FOLLOWLOCATION => 1,
    CURLOPT_AUTOREFERER => 1,
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_CONNECTTIMEOUT => 5,
    CURLOPT_TIMEOUT => 20,
    CURLOPT_VERBOSE => 0,
    CURLOPT_SSL_VERIFYHOST => 0,
    CURLOPT_SSL_VERIFYPEER => 0
);

$curl_headers = array();
$curl_headers[] = 'Accept: image/gif, image/x-bitmap, image/jpeg, image/pjpeg';
$curl_headers[] = 'Connection: Keep-Alive';
$curl_headers[] = 'Content-type: application/x-www-form-urlencoded;charset=UTF-8';

function get($url, $data = "") {

    if (strlen($url) < 7) return;
    //echo "\n<br> Sending GET :: $url\n<br>";
    if (is_array($data)) $data = implode("&", $data);
    if (strpos($url, "?") > 5) $url .= "&$data";
    else
        $url .= "?$data";

    global $curl_defaults;

    $rep = array(":", "/", ".", "?", "&", "+", "=");
    $fn = dirname(__FILE__) . "/cache/" . md5(str_replace($rep, "", $url)) . ".txt";

    if (file_exists($fn) && @filesize($fn)>1){   //Add a file time check Here
        //echo "\n<br>From Cache FileSize :: "  . filesize($fn);
        return file_get_contents($fn);
    }


    $ch = curl_init();
    curl_setopt_array($ch, $curl_defaults);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    $html = curl_exec($ch);

    @unlink($fn);
    if(strlen($html) > 100)
        write2file($fn, $html);

    return $html;
}

您可能需要进行一些更改。

缓存目录:./cache/