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Appending parameter to existing URL cause infinite loop

I have a page index.php, I want to append a parameter to the end of URL upon a certain action by user. So the result would be index.php?param=1
Using the below PHP code causing an infinite redirect loop.
<?php
header("Location: index.php?param=1");
?>
Using the below Javascript code result in infinite refresh loop.
window.location = "?param=1";
How can I append that parameter only once without encountering any loop using either PHP, Javascript or jQuery?

For the PHP version, try:
<?php
if( !isset( $_GET['param'] ) ){
header('location: index.php?param=1' );
}
?>

Please try add host name and then try.
Example - If you are using localhost.
<?php
header("Location: http://localhost/index.php?param=1");
?>

Apart from using Apache's mod_rewrite, you could check if the additional parameter is already set, e.g.
<?php
if (isset($_SERVER['QUERY_STRING']))
header("Location: index.php?param=1");
?>

It is better to use .htaccess files to set redirects due to there is the good practice to store logic and server configuration separately.
Here is .htaccess code for you:
Redirect /path/to/index.php http://yourdomain.com/path/to/index.php?param=1
or if you need to have permanent redirect use
Redirect 301 /path/to/index.php http://yourdomain.com/path/to/index.php?param=1
If you do not use Apache but Nginx or something else check their documentation how to make redirects. Typically it is very easy.

PHP redirect header is not redirecting?

I am using following code to redirect
header('Location: '.$fileID.'php');
}
else if (!isset($_SESSION['login']))
echo '<p>you need to register first.</p>' ;
?>
$fileID has a value bacuse I am using this value in other part of code and that works fine. I also tried
echo '<script>window.location="'.$fileID.'php"</script>';
but got a notfound error. I would like to get it working by any of these methods but would prefer the header method. Any help is appreciated.

I wanted to put this in a comment but I don't have enough reputation :( Anyways try changing your header from this:
header('Location: '.$fileID.'php');
To this:
header('Location: '.$fileID.'.php');

You should exit; after redirect with headers, because the script will go on executing otherwise which can lead to unintended side effects.
but got a notfound error.
URL seems wrong, echo the output and see if it matches your expected location.

location.href and Cannot send session cache limiter - headers already sent

I understand that there can be no output before setting the headers, and I believed that I am following that rule. I have a php page a.php:
<?php
session_start();
...
echo "<button id=\"searchForTeamsButton\">Search For Teams</button><br>";
...
?>
<script type="text/javascript">
document.getElementById("searchForTeamsButton").onclick = function () {
location.href = "b.php";
};
</script>
and php page b.php:
<?php
session_start();
?>
Upon clicking that button, I am receiving the classic headers already sent error. I am lead to believe that the location.href is not calling a new page "b.php", which allows for new headers. My true question here is what is the proper protocol for redirecting to new pages with links/ buttons? Perhaps location.href is the correct (and perhaps only) way, and perhaps my error is actually on b.php.
I appreciate any information here.
Thanks :)
Brent

Header location is not working on live server

I Have one registration and payment page. program flow is like registration > confirmation > payment. After validation and calculation in registration page need to go to confirmation page.
My code is
<?php
ob_start();
session_start();
include("header.php");
include("ini.php");
date_default_timezone_set('Asia/Brunei');
header('Cache-Control: max-age=900');
if (isset($_POST['submit'])) {
$error = 0;
//validations
if ($error <= 0) {
//do some calculation
header('location:confirm.php');
}
}
<?php
ob_flush();
?>
Control entered in to if ($error <= 0) clause, but stay on the registration page.
I tried many ways like
header('location:confirm.php', true, 302);
instead of
header('location:confirm.php');
removed
ob_start() and ob_flush()
add exit() after header()
then it goes to blank page.
Also try to use
echo '<script type="text/javascript">';
echo 'window.location.href="confirm.php";';
echo '</script>';
Then the control goes to confirmation page but url seems to be as registration.php
But header('location:confirm.php'); is working fine in my local server. Anybody please help me to resolve this issue.. Is there any alternate way for header(). Looking forward to you guys.. Thanks

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include, or require, functions, or another file access function, and have spaces or empty lines that are output before header() is called. The same problem exists when using a single PHP/HTML file.
Also try to change header('Location:confirm.php');
(Note L is capital since its work in your local server may be problem with strict php type try this once)

$host = $_SERVER['HTTP_HOST'];
$uri = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
$extra = 'confirm.php';
header("Location: http://$host$uri/$extra");

use ob_end_flush() at the end. This should work like charm.

i had the same issues for years but today i discovered that u don't have to have any html or blank space before the header word .Try it out

whether to use php or javascript method for redirecting a page

Whenever I user php header("Location: index.php"), most of time then it does not work. It exactly DOES NOT work without any error nor any run-time fatal error. I don't use any echoing nor I keep empty lines prior to header() call. I double check everthing, but it does not work.
Now, I user JS solution. I write a function that gets the param, store it in an immediately created <input> field and the using Javascript in the same function, I get the value out of input and assign it to window.location.href= value; which then finalizes the redirection. Is my method reliable and good?
My function seems like this:
function redirect($address)
{
?>
<input id='this_address' value="<?php echo $address; ?>" />
window.location.href = document.getElementById("this_address").value;
<?php
}

Are you sure that your index.php is in the same directory as the scripts that calls redirect or vice versa...?
If not try header("location:../../index.php");

Setting and cookies or session variables will cause issues with a redirect. It has to be sent before any output or exchange with the server and the client. Check your browser log for any errors too. It might be helpful in determining why you are not achieving the result you want.
You could also implement both methods, but it would be more useful to find out why your PHP redirect is not effective.

If u can't able to find out the solution for php header prob, Just add the below code at the top of the page. This is not the perfect way, but we can use this...
ob_start();

Why not use Response.Redirect "../../index.php" to redirect to another page.