how to check if there is a DIV enclosing a form element within the conditional PCRE?

$doc = new DOMDocument();
$doc->loadHTML($form);

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function ishidden($name,$html) {
	$dom = new DOMDocument();
	@$dom->loadHTML($html);
	$divs = $dom->getElementsByTagName("div");
	foreach ($divs as $div) {
		$style = $div->getAttribute("style");
		if (preg_match("/display:none|visibility:hidden/ims",$style)) {
			foreach ($div->childNodes as $child) {
				if ($child->getAttribute("name")==$name) {
					return true;
				}
			}
		}
	}
	return false;
}

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<?php // RAY_temp_intellisource.php
error_reporting(E_ALL);


// SEE http://www.experts-exchange.com/Programming/Languages/Regular_Expressions/Q_27296137.html?cid=1572


// A URL TO TEST WITH
$url = 'https://lmx.leads360.com/web/Login.aspx';

// READ THE GENERATED HTML STRING
$htm = my_curl($url);

// REMOVE THE END-OF-LINE CHARACTERS
$htm = str_replace(PHP_EOL, "", $htm);

// ISOLATE THE FORM
$form   = explode("<form",$htm);
$form   = explode("</form>",$form[1]);
$inputs = explode("<input",$form[0]);

// ISOLATE THE INPUTS TO THE REQUEST
foreach($inputs as $key => $val)
{
    // IDENTIFY THE ACTION SCRIPT
    $action = strpos($val, "action");
    if($action !== false)
    {
        // EXTRACT THE ACTION SCRIPT NAME FROM THE FORM INPUT
        $actstart = strpos($val, "\"", $action+1);
        $actend   = strpos($val, "\"", $actstart+1);
        $posturl  = substr($val, $actstart+1, ($actend-$actstart-1));
        continue;
    }

    // IDENTIFY THE INPUT FIELDS BY NAME AND VALUE PAIRS
    $name = strpos($val, "name");
    if($name !== false)
    {
        // EXTRACT THE NAME FROM THE FORM INPUT
        $namestart = strpos($val, "\"", $name+1);
        $nameend   = strpos($val, "\"", $namestart+1);
        $strname   = substr($val, $namestart+1, ($nameend-$namestart-1));

        // EXTRACT THE VALUE
        $value = strpos($val, "value");
        if($value !== false)
        {
            $valuestart = strpos($val, "\"", $value+1);
            $valueend   = strpos($val, "\"", $valuestart+1);
            $strvalue   = substr($val, $valuestart+1, ($valueend-$valuestart-1));
        }

        // IF NO VALUE
        else
        {
            $strvalue   = NULL;
        }
    }
    $postdata[$strname] = $strvalue;
}

// SHOW THE WORK PRODUCT
echo "<pre>";
echo PHP_EOL . "THE ACTION SCRIPT URL IS: $posturl";
echo PHP_EOL . "THE REQUEST ARGUMENTS ARE: ";
var_dump($postdata);



// A FUNCTION TO RUN A CURL-GET CLIENT CALL TO A FOREIGN SERVER
function my_curl
( $url
, $timeout=3
, $error_report=TRUE
)
{
    $curl = curl_init();

    // HEADERS AND OPTIONS APPEAR TO BE A FIREFOX BROWSER REFERRED BY GOOGLE
    $header[] = "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
    $header[] = "Cache-Control: max-age=0";
    $header[] = "Connection: keep-alive";
    $header[] = "Keep-Alive: 300";
    $header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
    $header[] = "Accept-Language: en-us,en;q=0.5";
    $header[] = "Pragma: "; // BROWSERS USUALLY LEAVE BLANK

    // SET THE CURL OPTIONS - SEE http://php.net/manual/en/function.curl-setopt.php
    curl_setopt( $curl, CURLOPT_URL,            $url  );
    curl_setopt( $curl, CURLOPT_USERAGENT,      'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'  );
    curl_setopt( $curl, CURLOPT_HTTPHEADER,     $header  );
    curl_setopt( $curl, CURLOPT_REFERER,        'http://www.google.com'  );
    curl_setopt( $curl, CURLOPT_ENCODING,       'gzip,deflate'  );
    curl_setopt( $curl, CURLOPT_AUTOREFERER,    TRUE  );
    curl_setopt( $curl, CURLOPT_RETURNTRANSFER, TRUE  );
    curl_setopt( $curl, CURLOPT_FOLLOWLOCATION, TRUE  );
    curl_setopt( $curl, CURLOPT_TIMEOUT,        $timeout  );

    // RUN THE CURL REQUEST AND GET THE RESULTS
    $htm = curl_exec($curl);

    // ON FAILURE HANDLE ERROR MESSAGE
    if ($htm === FALSE)
    {
        if ($error_report)
        {
            $err = curl_errno($curl);
            $inf = curl_getinfo($curl);
            echo "CURL FAIL: $url TIMEOUT=$timeout, CURL_ERRNO=$err";
            var_dump($inf);
        }
        curl_close($curl);
        return FALSE;
    }

    // ON SUCCESS RETURN XML / HTML STRING
    curl_close($curl);
    return $htm;
}

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function ishidden($name,$html) {
        $dom = new DOMDocument();
        @$dom->loadHTML($html);
        $divs = $dom->getElementsByTagName("div");
        foreach ($divs as $div) {
                $style = $div->getAttribute("style");
                if (preg_match("/display:none|visibility:hidden/ims",$style)) {
                        foreach ($div->childNodes as $child) {
                                if ($child->getAttribute("name")==$name) {
                                        return true;
                                }
                        }
                }
        }
        return false;
}

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