Panasonic IP Control over PHP

Found the following browsing the web in a pastebin:

<?php
class vieraControl
{
	public $host;
	 
	function __construct($hostname = false)
	{
		if ($hostname)
			$this->host = $hostname;
	}
	
	function createRequest($url, $urn, $action, $option = array())
	{
 
$input = '<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
  <s:Body>
   <u:'.$action.' xmlns:u="urn:'.$urn.'">
   '.$option['args'].'
  </u:'.$action.'>
 </s:Body>
</s:Envelope>';
		$curl = curl_init(); 
		curl_setopt($curl, CURLOPT_URL, 'http://'.$this->host.':55000/'.$url);
		curl_setopt($curl, CURLOPT_POST, 1);
		curl_setopt($curl, CURLOPT_HTTPHEADER, array('SOAPACTION: "urn:'.$urn.'#'.$action.'"'));   
		curl_setopt($curl, CURLOPT_POSTFIELDS, $input);
		//curl_setopt($curl, CURLOPT_HEADER, true);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
		$data = curl_exec($curl);
		
		if ($option['returnXml'])
			return $data;
		else
			return $this->getResponse($data);
	}
	
	function getResponse($data)
	{
		$xml = simplexml_load_string($data);
		if ($xml === false)
			return false;
		$ns = $xml->getNamespaces(true);
		$soap = $xml->children($ns['s']);
		$res = $soap->children($ns['u'])->children();
		return $res[0];
	}
	
	function getVolume()
	{
		return $this->createRequest(
			'dmr/control_0', 
			'schemas-upnp-org:service:RenderingControl:1',
			'GetVolume',
			array('args' => '<InstanceID>0</InstanceID><Channel>Master</Channel>')
		);
	}
	
	function sendKey($keyCode)
	{
		return $this->createRequest(
			'nrc/control_0', 
			'panasonic-com:service:p00NetworkControl:1',
			'X_SendKey',
			array(
				'args' => '<X_KeyEvent>' . $keyCode . '</X_KeyEvent>',
				'returnXml' => true
			)
		);
	}
	
	function getMute()
	{
		return $this->createRequest(
			'dmr/control_0', 
			'schemas-upnp-org:service:RenderingControl:1',
			'GetMute',
			array('args' => '<InstanceID>0</InstanceID><Channel>Master</Channel>')
		);
	}
	
	function setMute($enable = false)
	{
		$data = ($enable) ? '1' : '0';
		return $this->createRequest(
			'dmr/control_0', 
			'schemas-upnp-org:service:RenderingControl:1',
			'SetMute',
			array('args' => '<InstanceID>0</InstanceID><Channel>Master</Channel><DesiredMute>'.$data.'</DesiredMute>')
		);
	}

	function setVolume($volume = '0')
	{
		$volume = intval($volume);
		if ($volume > 100 || $volume < 0)
			throw new Exception('Bad request to volume control. Must be between 0 and 100');
			
		return $this->createRequest(
			'dmr/control_0', 
			'schemas-upnp-org:service:RenderingControl:1',
			'SetVolume',
			array('args' => '<InstanceID>0</InstanceID><Channel>Master</Channel><DesiredVolume>'.$volume.'</DesiredVolume>', 'returnXml' = > true)
		);
	}
	
	function sendString($string)
	{
		return $this->createRequest(
			'nrc/control_0', 
			'panasonic-com:service:p00NetworkControl:1',
			'X_SendString',
			array(
				'args' => '<X_String>' . $string . '</X_String>',
				'returnXml' => true
			)
		);		
	}
} 
 
$keys = array(
	"NRC_CH_DOWN-ONOFF", // channel down
	"NRC_CH_UP-ONOFF", // channel up
	"NRC_VOLUP-ONOFF", // volume up
	"NRC_VOLDOWN-ONOFF", // volume down
	"NRC_MUTE-ONOFF", // mute
	"NRC_TV-ONOFF", // TV
	"NRC_CHG_INPUT-ONOFF", // AV,
	"NRC_RED-ONOFF", // red
	"NRC_GREEN-ONOFF", // green
	"NRC_YELLOW-ONOFF", // yellow
	"NRC_BLUE-ONOFF", // blue
	"NRC_VTOOLS-ONOFF", // VIERA tools
	"NRC_CANCEL-ONOFF", // Cancel / Exit
	"NRC_SUBMENU-ONOFF", // Option
	"NRC_RETURN-ONOFF", // Return
	"NRC_ENTER-ONOFF", // Control Center click / enter
	"NRC_RIGHT-ONOFF", // Control RIGHT 
	"NRC_LEFT-ONOFF", // Control LEFT
	"NRC_UP-ONOFF", // Control UP
	"NRC_DOWN-ONOFF", // Control DOWN
	"NRC_3D-ONOFF", // 3D button
	"NRC_SD_CARD-ONOFF", // SD-card
	"NRC_DISP_MODE-ONOFF", // Display mode / Aspect ratio
	"NRC_MENU-ONOFF", // Menu
	"NRC_INTERNET-ONOFF", // VIERA connect
	"NRC_VIERA_LINK-ONOFF", // VIERA link
	"NRC_EPG-ONOFF", // Guide / EPG
	"NRC_TEXT-ONOFF", // Text / TTV
	"NRC_STTL-ONOFF", // STTL / Subtitles
	"NRC_INFO-ONOFF", // info 
	"NRC_INDEX-ONOFF", // TTV index
	"NRC_HOLD-ONOFF", // TTV hold / image freeze
	"NRC_R_TUNE-ONOFF", // Last view
	"NRC_POWER-ONOFF", // Power off
	
	"NRC_REW-ONOFF", // rewind
	"NRC_PLAY-ONOFF", // play
	"NRC_FF-ONOFF", // fast forward
	"NRC_SKIP_PREV-ONOFF", // skip previous
	"NRC_PAUSE-ONOFF", // pause
	"NRC_SKIP_NEXT-ONOFF", // skip next
	"NRC_STOP-ONOFF", // stop
	"NRC_REC-ONOFF", // record
	
	// numeric buttons
	"NRC_D1-ONOFF", "NRC_D2-ONOFF", "NRC_D3-ONOFF", "NRC_D4-ONOFF", "NRC_D5-ONOFF",
	"NRC_D6-ONOFF", "NRC_D7-ONOFF", "NRC_D8-ONOFF", "NRC_D9-ONOFF", "NRC_D0-ONOFF",
	
	// The below commands were not avaliable in the iPhone app when using my
	// VIERA G30 - they were pulled out from a disassembly instead
	// only these top three did anything on my TV
	
	"NRC_P_NR-ONOFF", // P-NR (Noise reduction)
	"NRC_OFFTIMER-ONOFF", // off timer 
	"NRC_R_TUNE-ONOFF", // Seems to do the same as INFO
	
	"NRC_CHG_NETWORK-ONOFF",
	"NRC_CC-ONOFF",
	"NRC_SAP-ONOFF",
	"NRC_RECLIST-ONOFF",
	"NRC_DRIVE-ONOFF",
	"NRC_DATA-ONOFF",
	"NRC_BD-ONOFF",
	"NRC_FAVORITE-ONOFF",
	"NRC_DIGA_CTL-ONOFF",
	"NRC_VOD-ONOFF",
	"NRC_ECO-ONOFF",
	"NRC_GAME-ONOFF",
	"NRC_EZ_SYNC-ONOFF",
	"NRC_PICTAI-ONOFF",
	"NRC_MPX-ONOFF",
	"NRC_SPLIT-ONOFF",
	"NRC_SWAP-ONOFF",
	"NRC_R_SCREEN-ONOFF",
	"NRC_30S_SKIP-ONOFF",
	"NRC_PROG-ONOFF", 
	"NRC_TV_MUTE_ON-ONOFF",
	"NRC_TV_MUTE_OFF-ONOFF",
	"NRC_DMS_CH_UP-ONOFF",
	"NRC_DMS_CH_DOWN-ONOFF"

 );