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/1.1\r\n";    $out .= "Host: www.example.com\r\n";    $out .= "Connection: Close\r\n\r\n";    fwrite($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 usecho "$errstr ($errno)\n";  }else{  //send the server request  fputs($fp, "POST $path HTTP/1.1\r\n");  fputs($fp, "Host: $host\r\n");  fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");  fputs($fp, "Content-length: ".strlen($poststring)."\r\n");  fputs($fp, "Connection: close\r\n\r\n");  fputs($fp, $poststring . "\r\n\r\n");  //loop through the response from the server  while(!feof($fp)) {    echo fgets($fp, 4096);  }  //close fp - we are done with it  fclose($fp);}

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