Phpcurl, fsockopen function

: This article mainly introduces phpcurl and fsockopen functions. For more information about PHP tutorials, see. The following example shows how to use curl and fsockopen. you can use it as an instance or as an encapsulated function.

Code used by the curl function

publicfunctionxcurl($url,$ref=null,$post=array(),$ua="Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre",$print=false) {$ch = curl_init();     curl_setopt($ch, CURLOPT_AUTOREFERER, true);     if(!empty($ref)) {          curl_setopt($ch, CURLOPT_REFERER, $ref);     }     curl_setopt($ch, CURLOPT_URL, $url);     curl_setopt($ch, CURLOPT_HEADER, 0);     curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);     if(!empty($ua)) {          curl_setopt($ch, CURLOPT_USERAGENT, $ua);     }     if(count($post) > 0){          curl_setopt($ch, CURLOPT_POST, 1);          curl_setopt($ch, CURLOPT_POSTFIELDS, $post);     }     $output = curl_exec($ch);     curl_close($ch);     if($print) {          print($output);     } else {          return$output;     }}

Code used for the fsockopen function:

publicfunctioncurl_request_async($url, $params, $type='GET')    {// set referer$referer = $_SERVER['HTTP_HOST'];        foreach ($paramsas$key => &$val) {            if (is_array($val)) $val = implode(',', $val);            $post_params[] = $key.'='.urlencode($val);        }        $post_string = implode('&', $post_params);        $parts=parse_url($url);        @$fp = fsockopen($parts['host'], isset($parts['port'])?$parts['port']:80, $errno, $errstr, 2);        if(!$fp){            echo"$errstr ($errno)
\n";        }else{            if('GET' == $type) $parts['path'] .= '?'.$post_string;            $out = "$type ".$parts['path']." HTTP/1.1\r\n";            $out.= "Host: ".$parts['host']."\r\n";            $out.= "Referer: ".$referer."\r\n";            $out.= "Content-Type: application/x-www-form-urlencoded\r\n";            $out.= "Connection: Close\r\n\r\n";            // Data goes in the request body for a POST requestif ('POST' == $type && isset($post_string)) $out.= $post_string;            fwrite($fp, $out);            fclose($fp);        }    }

The differences between the use of the above functions are as follows:
Curl requests a Url to wait for the result to be returned, and fsockopen does not need to be returned. after sending the request, the code continues to be executed. Unless you use fsockopen to print the results returned after the request.

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The above introduces php curl and fsockopen functions, including some content, and hope to help those who are interested in PHP tutorials.