Having trouble understanding the $this variable

dan_t · July 1, 2010

<style>
.prophp_LoginForm{
border: #0153EB 1px dotted;
padding: 5px;
width: 262px;
margin: auto;
font-size: 14px;
color: #0153EB;
font-weight: bold;
text-align: left;
background-color: #EEEEFF;
font-family: Arial, Helvetica, sans-serif;
}

.prophp_ErrorLine{
width: 250px;
border: #ff0000 1px solid;
background-color: #FFEEEE;
color: #FF0000;
padding: 5px;
}

.prophp_LoginLine{
clear: both;
padding: 2px;
}

.prophp_LoginLabel{
float: left;
width: 85px;
padding-top: 4px;
}

.prophp_LoginField{
float: left;
width: 169px;
}

.prophp_LoginInput{
width: 169px;
}

.prophp_LoginButton{
background-color: #0153EB;
color: #FFFFFF;
border: none;
cursor: pointer;
}

.prophp_Clear{
clear: both;
height: 1px;
}

</style>


<form class="prophp_LoginForm" method="post" action="index.php">
<?php if ($this->error_message){ ?>
<div class="prophp_ErrorLine"><?=$this->error_message?></div>
<?php } ?>
<div class="prophp_LoginLine">
	<div class="prophp_LoginLabel">Username :</div>
	<div class="prophp_LoginField"><input class="prophp_LoginInput" type="text" name="<?=$this->username_post_var?>" value="" /></div>
</div>
<div class="prophp_LoginLine">
	<div class="prophp_LoginLabel">Password :</div>
	<div class="prophp_LoginField"><input class="prophp_LoginInput" type="password" name="<?=$this->password_post_var?>" value="" /></div>
</div>
<div class="prophp_LoginLine">
	<div class="prophp_LoginLabel"> </div>
	<div class="prophp_LoginField"><input class="prophp_LoginButton" type="submit" name="doLogin" value="Login" /></div>
</div>
<div class="prophp_Clear"> </div>
</form>

Adam · July 1, 2010

Which variable?

dan_t · July 1, 2010

Sorry about that, here is the error: Fatal error: Using $this when not in object context

For some reason the this is having trouble.

OceanIdiot · July 1, 2010

$this is used in PHP Object Oriëntated programming. Maby you understand it if by looking at this example:

<?php
class car {
public function setColor($color) {
$this->color = $color;
}
public function getColor() {
return($this->color)
}
}
$car = new car();
$car->setColor("blue");
echo($car->getColor());
?>

You can only use $this in a class (object context).

dan_t · July 1, 2010

Is there a way to do away with the $this variable with out effecting the perfomance?

Stooney · July 1, 2010

<?php if ($this->error_message){ ?>

This is your problem. You only use '$this' when inside of a class.

dan_t · July 1, 2010

So can I simply replace $this with the actual href file name?

KevinM1 · July 1, 2010

Why don't you tell us what you're trying to do? It's hard to give a fix for your problem without seeing more than one line of PHP.

Stooney · July 1, 2010

You need to find the variable name for the object. Somewhere you should see something like this:

$variableName=new ClassName();

You would then change $this->error_message to $variableName->error_message (assuming you found the right variable). I can't help any further without seeing the part of the code where the class is initiated.

dan_t · July 1, 2010

OK,

Here is the entire thing, but I don't see anything useful.

Most of this is not even my code because he decided to go with a different look (mostly colors), and bought some template for a Homestead.com which had very confusing code all through it.

They named their pages in all caps and their links with lower case... etc.

A lot of the site that they sold him was cut and paste - [free scripts], and a lot done in javascript where I basically no little more than a document.write statement for output.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
	<!-- <hs:metatags> -->
	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
	<meta name="description" content="Free online dating and matchmaking for singles">
	<meta name="keywords" content="dating service,on-line dating service,mate,partner,women,man,love,free on-line dating,sex,long-term relationship,friends with benefits,hook-up, lonely">
	<meta name="generator" content="Intuit SiteBuilder by Homestead">
	<meta http-equiv="imagetoolbar" content="no">
	<meta http-equiv="imagetoolbar" content="false">
	<!-- </hs:metatags> -->

	<!-- <hs:title> -->
	<title></title>
	<!-- </hs:title> -->
	<script type="text/javascript">
		<!--
					function reDo() {
					        top.location.reload();
					}
					if (navigator.appName == 'Netscape' && parseInt(navigator.appVersion) < 5) {
					        top.onresize = reDo;
					}
					dom=document.getElementById
				//-->
	</script>
	<script type="text/javascript">
		<!--
						  

  var strRelativePagePath = "INDEX.html".toLowerCase();
  

  var strRelativePathToRoot = "";
  

  var myimages=new Array();
				function preloadImages(imageList)
				{
					if (document.images) 
					{ 
						for (i=0;i<imageList.length;i++)
						{
							myimages[i]=new Image();
							myimages[i].src=imageList[i];
						}
					}
				}
  function genericAlert() { 
									alert("Sorry. To use this feature, you need Internet Explorer."); 
									return true; 
								} 

								function addToFavorites(url, title) { 
									window.onerror = genericAlert; 
									if (navigator.appName == "Microsoft Internet Explorer") {  
										if (parseInt(navigator.appVersion) >= 4) { 
											window.external.AddFavorite(url, title); 
										} else { 
											friendlyAlert(); 
										}
									} else if (navigator.appName == "Netscape") { 
										friendlyAlert(); 
									} else { 
										genericAlert(); 
									} 
								}

								function friendlyAlert() { 
									var win = window.open("/~media/Elements/AddToFavorites/AddToFavorites.html", "HSFriendlyAlert", "width=265,height=100"); 
								}


					//-->
	</script>
	<link type="text/css" href="http://www.homestead.com/~media/elements/Text/font_styles_ns4.css" rel="stylesheet">
	<style type="text/css">
		@import url(http://www.homestead.com/~media/elements/Text/font_styles.css);
		div.lpxcenterpageouter { text-align: center; position: absolute; top: 0px; left: 0px; width: 100% }
		div.lpxcenterpageinner { position: relative; margin: 0 auto; text-align: left; width: 926px; }
	</style>
	<script type="text/javascript">
		<!--
						var unique_id = new Array();
		var form_name = new Array();
		var required = new Array();
		var req_message = new Array();

					//-->
	</script>

	<STYLE type="text/css">
		<!--
						.navBackgroundNavigationyss { background-image:url('/~media/elements/LayoutClipart/../LayoutClipart/NavTabs/Basic_Tab_White_Unselected.gif'); background-position: center; background-repeat:no-repeat }
						.navBackgroundSelectedNavigationyss { background-image:url('/~media/elements/LayoutClipart/../LayoutClipart/NavTabs/Basic_Tab_White_Selected.gif'); background-position: center; background-repeat:no-repeat }


					-->




	</STYLE>

	<link rel="stylesheet" type="text/css" href="log.css" />
	<!--
		Photo Gallery Element based on Lightbox v2.03.3 © 2006-2007 Lokesh Dhakar.

		For more information on Lightbox, visit:
		http://huddletogether.com/projects/lightbox2/

		Lightbox scripts licensed under the Creative Commons Attribution 2.5 License:
		http://creativecommons.org/licenses/by/2.5/
	-->
	<script type="text/javascript" src="http://www.homestead.com/~media/elements/PhotoGallery/js/prototype.js" language="JavaScript">
	</script>
	<script type="text/javascript" src="http://www.homestead.com/~media/elements/PhotoGallery/js/scriptaculous.js?load=effects" language="JavaScript">
	</script>
	<script type="text/javascript" src="http://www.homestead.com/~media/elements/PhotoGallery/js/lightbox.js" language="JavaScript">
	</script>
	<link href="http://www.homestead.com/~media/elements/PhotoGallery/css/lightbox.css" type="text/css" media="screen" rel="stylesheet">
	<STYLE type="text/css">
		<!--
						.navBackgroundNavigationbottom { background-image:url('/~media/elements/LayoutClipart/../LayoutClipart/NavTabs/Basic_Tab_White_Unselected.gif'); background-position: center; background-repeat:no-repeat }
						.navBackgroundSelectedNavigationbottom { background-image:url('/~media/elements/LayoutClipart/../LayoutClipart/NavTabs/Basic_Tab_White_Selected.gif'); background-position: center; background-repeat:no-repeat }
					-->
	</STYLE>
	<script type="text/javascript" src="/~site/Elements/HCUser_Forms_Submit/FormValidation.js">
	</script>
</head>
<body onunload="" alink="#406AB0" onload="preloadImages(new Array('files/surrealcoastalsunsetcrop.jpg')); " id="element1" link="#406AB0" bgcolor="#FFFFFF" scroll="auto" vlink="#406AB0">
	<noscript>
		<img alt="" src="http://www.homestead.com/~media/elements/shared/javascript_disabled.gif" height="40" border="0" width="373">
	</noscript>
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	</script>
	<noscript>
		<img alt="" src="/~site/Scripts_ExternalRedirect/ExternalRedirect.dll?CMD=CMDGetGif&H_SITEID=RTK4&H_AltURL=%2F%7Esite%2Ftp.gif&H_HSGOTOURL=http%3A%2F%2Fweb4.realtracker.com%2Fnetpoll%2Fimulti.asp%3Fuser%3D1756946738%26pn%3D90006%26pp%3DINDEX%26js%3D0%26b%3D0%26to%3D-360" height="1" border="0" width="1">
	</noscript>
	<!-- </hs:realtracker> -->
</body>
</html>

That's the whole thing in a nutshell

The system we are tring to use now is from a user session pro or something like that.

The code I made I couldn't figure out how to migrate with the javascript.

KevinM1 · July 1, 2010

So... where's the PHP in that last large chunk of code?

Or, to look at it a different way:

Who wrote the '$this' that's causing the error?

Stooney · July 1, 2010

You're issue has nothing to do with html, css, or javascript. We need to see the PHP code.

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Having trouble understanding the $this variable

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