I use the fololowing code for all links going outisde my website:
if ($_GET["url"])
{
$urll = base64_decode($_GET["url"]);
header("Location: ".$urll);
exit();
}
How can I show the Google Analytic's tracking code before the user is redirected so the page is tracked?
Could I just use a print statement?
Thanks.
If you wanted to track the hit with GA, then you will have to do something other than a redirect using HTTP headers. With that, you can't guarantee that the page content will be parsed and executed. I think in most browsers any content would be ignored.
Instead you will need to serve a page (could be blank) and use a javascript and/or meta redirect and place the GA code in there so it gets called prior to the redirect.
Something like this should work:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="refresh" content="1;URL">
<title>Redirect</title>
</head>
<body>
Redirecting...
<script type="text/javascript">
// put GA code here...
window.location = "URL";
</script>
</body>
</html>
You can't display any characters before a HTTP Header. It will cause the PHP to throw errors. You should do all of your tracking collection prior to putting them onto the page that has the 'Location:' Header on it.
Related
I'm using Codeigniter and I did the internationalization using :
CI-internationalization
I would like to add /en by default when the user access my site :
www.mysite.com -> www.mysite.com/en
What is the best way to achieve that ?
Thank you.
HTML redirects
The simplest way to redirect to another URL is with the Meta Refresh tag. You can place this meta tag inside the <head> at the top of any HTML page like this:
<meta http-equiv="refresh" content="0; URL='http://www.new-site.com/en'" />
The content attribute is the delay before the browser redirects to the new page, above example it is set to 0 seconds.
JavaScript redirects
Redirecting to another URL with JavaScript is pretty easy, we simply have to change the location property on the window object:
window.location = "http://www.new-site.com/en";
OR
window.location.href = "http://www.new-site.com/en";
OR
window.location.assign("http://www.new-site.com/en");
OR
window.location.replace("http://www.new-site.com/en");
PHP redirects
<?php
header('Location: http://www.new-site.com/en', true, 301);
exit();
?>
This has to be set before any markup or content of any other sort, however there is one small hitch. By default the function sends a 302 redirect response which tells everyone that the content has only been moved temporarily. Considering our specific use case we'll need to permanently move the files over to our new website, so we'll have to make a 301 redirect instead.
The optional true parameter above will replace a previously set header and the 301 at the end is what changes the response code to the right one
Source: https://css-tricks.com/redirect-web-page/
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>
Testing page
</title>
<meta http-equiv="refresh" content="0; URL='new/test.html'" />
</head>
<body>
Old page
</body>
</html>
second/new page
<html>
<head>
<title>new site
</title>
</head>
<body>
this is new page.
</body>
</html>
I currently have a webpage that's taking a while to load. The php side of the page does a lot of data processing and computation, and that's (unfortunately) unavoidable. I would like to display something on the page while the php is processing. Unfortunately, the majority of the page depends on the php computation.
The current solution I have is the following:
The HTML/PHP (beginning):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title id="title">Loading</title>
<link href="style.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="preLoading.js"></script>
</head>
<body onload="onLoad()">
<?php
flush();
?>
<?php
// computation.
?>
The javascript:
document.write('<span id="loading">Please wait... Loading and processing data.</span>');
function onLoad() {
if (document.getElementById) {
var loading = document.getElementById("loading");
loading.style.display="none";
}
}
It works well in the sense that while the page is rendering, there's a little waiting message displayed while the page renders. But it does not work in the sense that the page still waits for all the data to be received before rendering anything. How can I accomplish the latter?
One thing of note: the blank line before the doctype contains 1024 spaces, because I read in some places (including StackOverflow) that browsers wait until reading a certain number of characters before attempting to render anything.
Any ideas would be appreciated. Browsers are filled with arcane tricks and hacks that mystify me.
A better choice would be to have only the page's skeleton sent out, and then fetch the computational expensive data via AJAX calls. That way you can put up a placeholder page and fill in things as they become available.
The upside of this is that you're not dependent on flushing buffers - which do not guarantee that the data will actually be sent to the client, only that the next higher layer in the software stack should get everything that's available right now.
The downside is that now you'll have at least two HTTP requests to generate the page - one to fetch the page's skeleton, and at least one or more for the AJAX request(s) to fetch the "fill in the blanks" data.
Try this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title id="title">Loading</title>
<link href="style.css" rel="stylesheet" type="text/css"/>
<script type ="text/javascript" src="jquery.js"> </script>
<script type="text/javascript">
$(document).ready(function(){
$.get('data.php',
function(output) {
$('#dataDiv').html(output).fadeIn(250);
});
});
</script>
</head>
<body>
<div id="dataDiv"> Please wait while loading... </div>
<?php
// computations placed in data.php file
?>
Please note this requires the use of jQuery and you to move your php computations to the "data.php" file.
Try using
flush(); ob_flush();
as stated in the php manual. This brings the output as close to the browser as possible.
More information about pushing the buffer to the browser can be read in the php manual for flush();
For the beginning try placing the loader message straight after body tag. This way browser should display it asap.
Check configuration for not having compression (e.g. gzip) on by default.
Don't use tables. They are not rendered before fully loaded.
Load the content that takes forever with an Ajax call.
You need to turn output buffering off and implicitly flush output as your PHP process does its job.
You might want to checkout Output Buffering. Also note that flushing the buffer is dependent on the browser and how much it expects before it shows output.
A related question that you might find useful.
I was learning PHP and trying to redirect pages based on if the cookie is set or not so below is the code I used to set the cookie on the first page
<?php
setcookie("test","logged in",time()+60,'/');
?>
Now on the testing page I delete the cookie but it doesn't get deleted below is the code
<?php
setcookie("test", 0, time()-(60*60*24*7));
if(isset($_COOKIE['test']))
{
echo "u had logged in";
}
else
header("Location: index.php");
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
</body>
</html>
What exactly is the problem ?
Cookies are only set when a page is transmitted to the browser and are only read when they're sent to the server as a part of a HTTP request.
As such:
If you delete a cookie, it won't disappear until the next page load.
If you set a cookie, the value can't be read until the next page load.
A common way of dealing with this is to set/delete a cookie and then perform a re-direct.
Changes made to cookies are only visible to the server on refresh. If you reload the testing page, you shouldn't see the "logged in" text.
I have a test.php page
in this page , there is a url . i need to execute that url (here database updation is doing).This is my code
<?php
$username ='testUsername';
if($_GET['age']!=''){
header('location:www.test.com/update.php?age='.$_GET['age'].'&username='.$username); //need to updatethe age of this username
$show ='hello';
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<body>
<?php echo $show ?>
</body>
</html>
i know this code is not going to work properly.How can i write in a good way.I donot want to redirect the page.I just need to execute that link
Just call file_get_contents on the url in question instead of setting the location header to that value.
Since the update.php file is hosted on an external website, the only thing you can do is get the contents of the output of the file. (Use file_get_contents to get that output.) That is, it will call the file (with your parameters) and you can fetch the HTML result of it—nothing more. It would be a major security problem if server files could be executed on external websites.
If you need to include the code in update.php without redirecting, you can do so with the include or require functions.
require() is identical to include()
except upon failure it will ... halt
the script whereas include() only
emits a warning (E_WARNING) which
allows the script to continue.
Use the IMG tag. <img widht=0 height=0 src="<?='location:www.test.com/update.php?age='.$_GET['age'].'&username='.$username ?>" />
I have actually discovered my problem but I am really want to know why this is an issue. I had two pages form1.php I started a session on that page and hit submit. Then I had a link to session2.php which started that session and was able to pull the information from form1.php. I am just learning about sessions and this was a very simple exercise to learn what a session can do.
Here lies the issue, I had a stylesheet link in my head and it had a blank href well it was href="#" and when that was there the session2.php would not start the session from form1.php and grab the info from the form. Without that href="#" in the style tag it worked fine, and it also worked fine if it was a fake styletag href="something.css" but href="" doesn't work either.
Why is this? I only have those in because its a template I made for workflow, maybe I cant include the css link in my template anymore to prevent future issues.
You can see this site working here, if I haven't explained myself.
form1.php
<?php
session_start();
$_SESSION['name'] = $username;
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
<!--//CSS STYLESHEETS//-->
<link rel="stylesheet" href="#" type="text/css">
</head>
<body>
Go to session 2
<!--form stuff is in here-->
</body
session2.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
</head>
<body>
<?php
session_start();
$username = $_SESSION['name'];
echo $username;
?>
</body>
</html>
Your second page needs to look like this:
<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title></title>
</head>
<body>
<?php
$username = $_SESSION['name'];
echo $username;
?>
</body>
</html>
Note that session_start() must appear before any content is printed to the screen.
Per the note on the session_start PHP manual page:
Note: To use cookie-based sessions, session_start() must be called before outputing anything to the browser.
To work like you want it, you need to have started the session first. Sounds simple, because it is. When you say session_start, php then looks for an accepted session cookie first to process content.
From http://php.net/manual/en/function.session-start.php
Note: To use cookie-based sessions, session_start() must be called before outputing anything to the browser.
Are you trying to output stuff to the page before you send the headers? What happens if you put the stylesheet after you call session_start()?