PHP之curl函数相关试题

<?php
class curl{

    private $ch = ‘‘;
    private $timeout = 5;
    public  $options = array();
    public  $headers = array();
    public  $url = ‘‘;

    function __construct()
    {
        $this -> ch = curl_init();
        $this -> headers[] = "Accept: */*";
        $this -> headers[] = "Accept-Encoding: gzip,deflate,sdch";
        $this -> headers[] = "Connection: keep-alive";
    }

    public function get($url,$timeout = NULL)
    {
        $this -> url = $url;
        $this -> options[CURLOPT_TIMEOUT] = $timeout?$timeout : $this -> timeout;
        $this -> setopt();
        return $this -> result();
    }

    public function post($url,$data,$timeout = NULL)
    {
        $this -> url = $url;
        $this -> options[CURLOPT_TIMEOUT] = $timeout?$timeout : $this -> timeout;
        $this -> options[CURLOPT_POST] = true;
        $this -> options[CURLOPT_POSTFIELDS] = $data;
        $this -> setopt();
        return $this -> result();
    }
    
    private function setopt()
    {
        curl_setopt($this -> ch, CURLOPT_URL, $this -> url);
        curl_setopt($this -> ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($this -> ch, CURLOPT_ENCODING , ‘gzip‘);
        curl_setopt($this -> ch, CURLOPT_HTTPHEADER, $this -> headers);
        curl_setopt_array($this -> ch, $this -> options);
    }

    private function execs() {return curl_exec($this -> ch);}
    private function status(){return curl_getinfo($this -> ch, CURLINFO_HTTP_CODE);}
    private function error() {return (curl_errno($this -> ch))?curl_error($this -> ch) : ‘‘;}
    private function result()
    {
        $result[‘response‘] = $this -> execs();
        $result[‘status‘] = $this -> status();
        $result[‘error‘] = $this -> error();
        return $result;
    }
}