PHP中 fsockopen 函数怎么用？

在PHP中fsockopen函数的作用是打开一个网络连接或者一个Unix套接字连接，其语法为“fsockopen($hostname) ”，返回值为一个文件句柄，之后可以被其他文件类函数调用。

简单示例

<?php $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30); if (!$fp) {     echo "$errstr ($errno)<br />n"; } else {     $out = "GET / HTTP/1.1rn";     $out .= "Host: www.example.comrn";     $out .= "Connection: Closernrn";     fwrite($fp, $out);     while (!feof($fp)) {         echo fgets($fp, 128);     }     fclose($fp); } ?>

使用UDP连接

<?php $fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr); if (!$fp) {     echo "ERROR: $errno - $errstr<br />n"; } else {     fwrite($fp, "n");     echo fread($fp, 26);     fclose($fp); } ?>

使用示例

<?php $host = "something.example.com"; $port = 443; $path = "/the/url/path/file.php"; //or .dll, etc. for authnet, etc.  //you will need to setup an array of fields to post with //then create the post string $formdata = array ( "x_field" => "somevalue"); //build the post string   foreach($formdata AS $key => $val){     $poststring .= urlencode($key) . "=" . urlencode($val) . "&";   } // strip off trailing ampersand $poststring = substr($poststring, 0, -1);  $fp = fsockopen("ssl://".$host, $port, $errno, $errstr, $timeout = 30);  if(!$fp){ //error tell us echo "$errstr ($errno)n";    }else{    //send the server request   fputs($fp, "POST $path HTTP/1.1rn");   fputs($fp, "Host: $hostrn");   fputs($fp, "Content-type: application/x-www-form-urlencodedrn");   fputs($fp, "Content-length: ".strlen($poststring)."rn");   fputs($fp, "Connection: closernrn");   fputs($fp, $poststring . "rnrn");    //loop through the response from the server   while(!feof($fp)) {     echo fgets($fp, 4096);   }   //close fp - we are done with it   fclose($fp); }

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