How to implement long and short URLs in PHP

This article mainly introduces the implementation method of PHP long URL and short URL. Friends who need it can refer to it

As the name suggests, a long link is a very long link; a short link is a very short link . Long links can generate short links, and short links come from long links.

What are long links and short links

As the name suggests, a long link is a very long link; a short link is a very short link . Long links can generate short links, and short links come from long links.

Why should we use long links and short links?

is more beautiful. We can compare long links and short links. Obviously we can see Outgoing short links are shorter and more beautiful than outgoing links.

Security, long links may carry some parameters, such as http://xxx.xxx.xxx?id=1¶m1=san, we can easily see that the url uses get method, and you can also see which parameters are requested. However, we can only access the short link http://t.cn/RNGQRUJ and cannot easily check what parameters and other conditions are carried there.

Sample code download address: Link: https://pan.baidu.com/s/1kVh4FQ3 Password: 4r8p

##Usage scenario

Sharing of Weibo content

The link contained in the text message

WeChat sharing link

Implementation method

According to Baidu Encyclopedia’s explanation, the conversion of long links into short links mainly uses md5 encryption to achieve the conversion.

Code implementation

Create a curl tool function

// SINA_APPKEY就是你在微信开发者平台的appkey 
define('SINA_APPKEY', ''); 
function curlQuery($url) 
{ 
  //设置附加HTTP头 
  $addHead = array( 
    "Content-type: application/json", 
  ); 
  //初始化curl，当然，你也可以用fsockopen代替 
  $curl_obj = curl_init(); 
  //设置网址 
  curl_setopt($curl_obj, CURLOPT_URL, $url); 
  //附加Head内容 
  curl_setopt($curl_obj, CURLOPT_HTTPHEADER, $addHead); 
  //是否输出返回头信息 
  curl_setopt($curl_obj, CURLOPT_HEADER, 0); 
  //将curl_exec的结果返回 
  curl_setopt($curl_obj, CURLOPT_RETURNTRANSFER, 1); 
  //设置超时时间 
  curl_setopt($curl_obj, CURLOPT_TIMEOUT, 15); 
  //执行 
  $result = curl_exec($curl_obj); 
  //关闭curl回话 
  curl_close($curl_obj); 
  return $result; 
}

Methods to create short links and long links

//根据长网址获取短网址 
function sinaShortenUrl($long_url) 
{ 
  //拼接请求地址，此地址你可以在官方的文档中查看到 
  $url = 'http://api.t.sina.com.cn/short_url/shorten.json?source=' . SINA_APPKEY . '&url_long=' . $long_url; 
  //获取请求结果 
  $result = curlQuery($url); 
  //下面这行注释用于调试， 
  //print_r($result);exit(); 
  //解析json 
  $json = json_decode($result); 
  //异常情况返回false 
  if (isset($json->error) || !isset($json[0]->url_short) || $json[0]->url_short == '') { 
    return false; 
  } else { 
    return $json[0]->url_short; 
  } 
} 
//根据短网址获取长网址，此函数重用了不少sinaShortenUrl中的代码，以方便你阅读对比，你可以自行合并两个函数 
function sinaExpandUrl($short_url) 
{ 
  //拼接请求地址，此地址你可以在官方的文档中查看到 
  $url = 'http://api.t.sina.com.cn/short_url/expand.json?source=' . SINA_APPKEY . '&url_short=' . $short_url; 
  //获取请求结果 
  $result = curlQuery($url); 
  //下面这行注释用于调试 
  //print_r($result);exit(); 
  //解析json 
  $json = json_decode($result); 
  //异常情况返回false 
  if (isset($json->error) || !isset($json[0]->url_long) || $json[0]->url_long == '') { 
    return false; 
  } else { 
    return $json[0]->url_long; 
  } 
}

Create a url processing function

//简单处理下url，sina对于没有协议(http://)开头的和不规范的地址会返回错误 
function filterUrl($url = '') 
{ 
  $url = trim(strtolower($url)); 
  $url = trim(preg_replace('/^http:\//', '', $url)); 
  if ($url == '') { 
    return false; 
  } else { 
    return urlencode('http://' . $url); 
  } 
}

Calling function

//要缩短的网址 
$url = "http://www.qqdeveloper.com/detail/25/1.html"; //这里自己看着办，修改成你要缩短的网址还是获取post的数据还是怎么滴。 
$url = filterUrl($url); //对URL进行简单处理的方法 
echo $short = sinaShortenUrl($url); //根据传入的长网址生产短网址 
echo "</br>"; 
echo $ulong = sinaExpandUrl($short);

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