How does php return garbled characters?

The following is the returned result: {code...} The following is the code and the code is also written. why is it garbled? : {Code...} The following is the returned result:

var hq_str_sh601006="������·,6.360,6.350,6.330,6.390,6.320,6.320,6.330,25996996,165270113.000,1055700,6.320,412700,6.310,524900,6.300,116900,6.290,131500,6.280,93700,6.330,340020,6.340,728100,6.350,668100,6.360,928814,6.370,2016-08-26,15:00:00,00"; 

The following is the code and the code is also written. why is it garbled? :

        
      PHP lab-3
  "; Function getCurlData ($ url) {if (empty ($ url) {return false;} $ ch = curl_init (); curl_setopt ($ ch, CURLOPT_URL, $ url ); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ ch, CURLOPT_HEADER, 0); $ output = curl_exec ($ ch); curl_close ($ ch); return $ output ;}

Reply content:

The returned results are as follows:

var hq_str_sh601006="������·,6.360,6.350,6.330,6.390,6.320,6.320,6.330,25996996,165270113.000,1055700,6.320,412700,6.310,524900,6.300,116900,6.290,131500,6.280,93700,6.330,340020,6.340,728100,6.350,668100,6.360,928814,6.370,2016-08-26,15:00:00,00"; 

The following is the code and the code is also written. why is it garbled? :

        
      PHP lab-3
  "; Function getCurlData ($ url) {if (empty ($ url) {return false;} $ ch = curl_init (); curl_setopt ($ ch, CURLOPT_URL, $ url ); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ ch, CURLOPT_HEADER, 0); $ output = curl_exec ($ ch); curl_close ($ ch); return $ output ;}

Last changed return iconv('gbk', 'UTF-8', $output);Okay. The key is the GBK web page.

~   ᐅ curl -I http://hq.sinajs.cn/list\=sh601006HTTP/1.1 200 OKCache-Control: no-cacheContent-Length: 250Connection: Keep-AliveContent-Type: application/x-javascript; charset=GBK

The original site is gbk