curl cross-domain fetch data

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class Curl{

protected $c;

public function __construct(){

$this->c = curl_init();

curl_setopt($this->c,CURLOPT_RETURNTRANSFER,1);

//1 means get the returned content; 0 means output the returned content

curl_setopt($this->c,CURLOPT_HEADER,0);

//0 means do not output the header file, non-0 means output the header file

}

public function getDate($url){

curl_setopt($this->c,CURLOPT_URL,$url);

return $res = curl_exec($this->c);

}

// public function get

public function postData($url,$data){ //data=['mod'=>'product','col_key'=>'product']

$data = $this->createUrlData($data);

curl_setopt($this->c,CURLOPT_HTTPHEADER,array('Expect'));

//To prevent 417 errors, the passed string is larger than 1024 bytes

curl_setopt($this->c,CURLOPT_URL,$url);

curl_setopt($this->c,CURLOPT_POST,1);

//Set the request type to post

curl_setopt($this->c,CURLOPT_POSTFIELDS,$data);

//Add post data to the request

return curl_exec($this->c);

}

public function createUrlData($arr){ //得到mod=product&col_key=product

$str = '';

if(!empty($arr)){

foreach($arr as $key=>$value){

$str.= $key.'='.$value.'&';

}

$str = substr($str,0,-1);

}

return $str;

}

public function __destruct(){

curl_close($this->c);

}

}

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