Модифицировать код с php5.5 на php5.6

<?php
// Convert dict to string
$data = "";
foreach ($_POST as $key => $val)
{
/*  switch($key){
    case "author_fld":
    case "docname_fld":
    case "annotation_fld":
    case "KeyWRDS_fld":
    case "theme_context":
        $data .= "&".$key."=".iconv("utf8", "windows-1251", $val);
        break;
    default:*/
            $data .= "&".$key."=".$val;
    //}
}
// Open socket to 
$fp = fsockopen("ip.ip.ip.ip", 80, $errno, $errstr, 30);
 
// Set data to POST request
$out = "POST /page_lib.php HTTP/1.0\r\n";
$out .= "Host: ip.ip.ip.ip\r\n";
$out .= "Referer: ip.ip.ip.ip\r\n";
$out .= "User-Agent: Opera\r\n";
$out .= "Content-Type: application/x-www-form-urlencoded\r\n";
$out .= "Content-Length: ".strlen($data)."\r\n\r\n";
$data = iconv("windows-1251", "utf8", $data);
$out .= $data."\r\n\r\n";
// Write request
fwrite($fp, $out);
 
// Read 9 line of Header 
for($i = 0; $i < 9; $i++)
    header(fgets($fp, 4096));
 
// Read other html content
while (!feof($fp)) {
    //$line = fgets($fp, 128);
    //convert_cyr_string($line,'w','k'); 
    //echo $line;   
    echo  fgets($fp, 128);
    //iconv("windows-1251", "utf8", fgets($fp, 128));
}
// Close socket
fclose($fp);
 
?>