<?php

/**
* DEMO用的源码
* 代码混乱，仅提供简单的思路，请勿用于生产环境
* auther: jucelin.com
* link: https://jucelin.com/php-get-sina-weibo-short-url.html
*/

$url=isset($_GET['url'])?$_GET['url']:'';
$backurl="";

define("APPKEY", "1234567890");//要修改这里的key再测试

if($url===""){
	echo 'URL SHOULD NOT BE EMPTY';
	exit();
}

if (isset($_GET['type'])){
	$type=$_GET['type'];
	switch (trim($type))
	{
	case 1:
		$backurl=shorturl($_GET['url']);
		break;
	case 2:
		$backurl=expandurl($_GET['url']);
		break;
	default:
		$backurl="ERROR TYPE";
	}
}
echo $backurl;

function shortenSinaUrl($long_url){
	$apiUrl='http://api.t.sina.com.cn/short_url/shorten.json?source='.APPKEY.'&url_long='.$long_url;
	$curlObj = curl_init();
	curl_setopt($curlObj, CURLOPT_URL, $apiUrl);
	curl_setopt($curlObj, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($curlObj, CURLOPT_SSL_VERIFYPEER, 0);
	curl_setopt($curlObj, CURLOPT_HEADER, 0);
	curl_setopt($curlObj, CURLOPT_HTTPHEADER, array('Content-type:application/json'));
	$response = curl_exec($curlObj);
	curl_close($curlObj);
	$json = json_decode($response);
	return $json[0]->url_short;
}

function expandSinaUrl($short_url){
	$apiUrl='http://api.t.sina.com.cn/short_url/expand.json?source='.APPKEY.'&url_short='.$short_url;
	$curlObj = curl_init();
	curl_setopt($curlObj, CURLOPT_URL, $apiUrl);
	curl_setopt($curlObj, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($curlObj, CURLOPT_SSL_VERIFYPEER, 0);
	curl_setopt($curlObj, CURLOPT_HEADER, 0);
	curl_setopt($curlObj, CURLOPT_HTTPHEADER, array('Content-type:application/json'));
	$response = curl_exec($curlObj);
	curl_close($curlObj);
	$json = json_decode($response);
	return $json[0]->url_long;
}


function shorturl($long_url){
	$apiUrl='http://api.t.sina.com.cn/short_url/shorten.json?source='.APPKEY.'&url_long='.$long_url;
	$response = file_get_contents($apiUrl);
	$json = json_decode($response);
	return $json[0]->url_short;
}

function expandurl($short_url){
	$apiUrl='http://api.t.sina.com.cn/short_url/expand.json?source='.APPKEY.'&url_short='.$short_url;
	
	$response = file_get_contents($apiUrl);
	$json = json_decode($response);
	return $json[0]->url_long;
}
?>