使用微信API 进行文件下载

<?php 
define("AppID","");
define("AppSecret", "");


$url1 = "https://api.weixin.qq.com/cgi-bin/material/get_material?access_token=".token();
$josn1 = '{"media_id":"XXXXXXX"}'; // 一个永久素材的id
$ret = https_request($url1,$josn1);
saveWeixinFile("1.jpg",$ret); //下载后好的文件名


function saveWeixinFile($filename, $filecontent)
{
    $local_file = fopen($filename, 'w');
    if (false !== $local_file){
        if (false !== fwrite($local_file, $filecontent)) {
            fclose($local_file);
        }
    }
}

function https_request($url, $data = null)
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    if (!empty($data)){
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($curl);
    curl_close($curl);
    return $output;
}


function token(){
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".AppID."&secret=".AppSecret;
    $data = json_decode(file_get_contents($url),true);
if($data['access_token']){
return $data['access_token'];
    }else{
        echo "Error";
   exit();
    }
}
?>