简单示例：

/**
 * @param $url
 * @return array
 * 进行https请求，并且遇到location进行跳转
 */
function https($url){
    $result = array();
    $UA = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36';
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);//直接跳转到location指定的页面
    curl_setopt($ch, CURLOPT_USERAGENT, $UA);
    $result['http_content'] = curl_exec($ch);
    $result['location'] = curl_getinfo($ch,CURLINFO_EFFECTIVE_URL);
    curl_close($ch);
    return $result;
}

一个更好的https请求类：

<?php

/*
 * @brief url封装类，将常用的url请求操作封装在一起
 * */
class URL{
    private $error;

    public function __construct(){
        //$this->error = new ErrorCase();
    }

    /**
     * combineURL
     * 拼接url
     * @param string $baseURL   基于的url
     * @param array  $keysArr   参数列表数组
     * @return string           返回拼接的url
     */
    public function combineURL($baseURL,$keysArr){
        $combined = $baseURL."?";//拼接？
        $valueArr = array();

        //拼接参数
        foreach($keysArr as $key => $val){
            $valueArr[] = "$key=$val";
        }

        //将参数拼接为字符串
        $keyStr = implode("&",$valueArr);
        //拼接为完整的URL
        $combined .= ($keyStr);

        return $combined;
    }

    /**
     * get_contents
     * 服务器通过get请求获得内容
     * @param string $url       请求的url,拼接后的
     * @return string           请求返回的内容
     */
    public function get_contents($url){
        if (ini_get("allow_url_fopen") == "1") {
            $response = file_get_contents($url);
        }else{
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
            curl_setopt($ch, CURLOPT_URL, $url);
            $response =  curl_exec($ch);
            curl_close($ch);
        }

        //-------请求为空
        if(empty($response)){
            //$this->error->showError("50001");
        }

        return $response;
    }

    /**
     * get
     * get方式请求资源
     * @param string $url     基于的baseUrl
     * @param array $keysArr  参数列表数组
     * @return string         返回的资源内容
     */
    public function get($url, $keysArr){
        $combined = $this->combineURL($url, $keysArr);
        return $this->get_contents($combined);
    }

    /**
     * post
     * post方式请求资源
     * @param string $url       基于的baseUrl
     * @param array $keysArr    请求的参数列表
     * @param int $flag         标志位
     * @return string           返回的资源内容
     */
    public function post($url, $keysArr, $flag = 0){

        $ch = curl_init();
        if(! $flag) curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $keysArr);
        curl_setopt($ch, CURLOPT_URL, $url);
        $ret = curl_exec($ch);

        curl_close($ch);
        return $ret;
    }
}