Let's say, I'll have a webpage "abcde.com" with two submit buttons: "Set GET 1" and "Set GET 2". The "Set GET 1" button redirects user to abcde.com?first=x. The "Set GET 2" button redirects user to abcde.com?second=x. Both using PHP's ('Location: ?first=') and ('Location: ?second=').
If user clicks on Set GET 1, GET parameter will be set in the URL. However, if user clicks on Set GET 2 right after setting the first GET parameter, the button will redirect him to the second parameter, removing the first one from the URL.
Is it possible to achieve setting multiple GET parameters in the URL divided by & in PHP without writing if (isset($_GET["first"])) { ('Location: ?first=x&?second=x') }?
I mean, so it can add & and set another parameter without removing the previous one? Even though I understand that PHP redirects user to URL without previous GET parameter.
Use $_GET to store current query string in an array, append your values to it, then build the new querystring with http_build_query:
$queryArray = $_GET;
$queryArray['second']='x';
$urlWithQueryString = 'http://example.com/somepage/?' . http_build_query($queryArray);
header('Location:'.$urlWithQueryString);
Related
I am trying to implement a feature where after a button is clicked, the server redirects the user to a new webpage with some variables in the url. I am running into a bug where the header function keeps appending to my existing url instead of refreshing it. EX:
http://localhost/455Project/messaging.php/new_message.php/?ssn=
messaging.php contains a button which when clicked redirects to new_message.php with a ssn attribute.
var_dump($_GET);
$temp = $_GET['patient'];
if(isset($_GET['new_message'])) {
$url = "new_message.php/?ssn=" . $temp;
header("Location: " . $url);
die();
}
The current url has the attribute which I want to get passed to the next. The var_dump has the correct value. I have also tried using "/455Project/new_message.php/?ssn=" which solves the url appending but in either instance the $temp variable doesn't append the proper value.
EDIT: I have a dropdown that produces the url like this echo "
`href='messaging.php/?patient=$patient_ssn_row[0]'>$name_row[0] $name_row[1]'</a>";`
This corresponds to a dropdown with data and the user selects one of the options.
I'm trying to make an <a> link which triggers PHP code on the next page. I've tried using $_GET variables to do this but the thing is I also want to remove the variable afterwards, as I automatically link back to the redirected page with header(). There don't seem to be any feasible ways to do this without redirecting the user to one page alone, but the thing is they're expected to be redirected to the page they were on previously. Keeping $_GET variables then cause an endless loop of redirects.
In general, I wish to avoid using $_GET as it could be abused in the context I'm using it in. Any other workarounds would be greatly appreciated, though. Basically I'm just trying to use an <a> link to remove an entry from a MySQL database.
Here's the PHP that handles the variable.
if (isset($_GET['rm'])) # 'rm' contains the uuid of the entry to be deleted.
{
$uuid = $_GET['rm'];
unset($_GET['rm']); # Didn't expect this to work, of course it didn't remove the variable from the URL.
$query = "DELETE FROM posts WHERE uuid = '$uuid'";
$result = $mysqli->query($query);
header("Location: " . $_SERVER['REQUEST_URI']);
exit();
}
EDIT: I realize now that I have wildly complicated my explanation here. The main goal was to make the click of an <a> link trigger PHP code, with a variable specific to the link clicked. (Each link is a delete button on a post, and each post has a UUID)
If there is a way to alternatively trigger javascript code, that would be immensely helpful as well, since I'm looking to use such a method here too. I will likely be making a separate thread asking about this.
You can use $_SESSION to delete the variable after for example
if (isset($_SESSION['rm'])) # 'rm' contains the uuid of the entry to be deleted.
{
$uuid = $_SESSION['rm'];
unset($_SESSION['rm']); # Didn't expect this to work, of course it didn't remove the variable from the URL.
$query = "DELETE FROM posts WHERE uuid = '$uuid'";
$result = $mysqli->query($query);
header("Location: " . $_SERVER['REQUEST_URI']);
exit();
}
consider that you have register the value of the next shape.
$_SESSION['rm'] = "My value";
If your goal is to redirect to the current page but remove the query string, you can redirect to header("Location: ?"); which is essentially just that. (Technically you are redirecting to a new query string with no value which is different than no query string at all but php will just show an empty array for $_GET which is essentially the same)
I was going to mention additional options like variables from $_SERVER, but many of those have various security or other issues associated with them. I only mention this because I wouldn't suggest using any unless necessary. Also, it really doesn't get easier than the above.
For example, I have a page called profile_page.php. This page is only functional if data is written after the ?u= in the URL, for example, data for Alice's profile page can only be seen when the URL reads http://localhost/profile_page/alice.
Loading http://localhost/profile_page will give me undefined variable errors as most of my variable's are depending on the URL to have a value after the ?u=. For example, the variable $firstname can only be gathered when I get her username in the URL.
In such a case, when http://localhost/profile_page, I would rather have it redirect the user to their own profile_page, but I don't know how I can test the URL and parse it through an if statement.
I understand you can use $u=$_GET['u']; to obtain the current page URL? but I don't think doing this, is the best way to go about it:
$u=$_GET['u'];
if ($u == "http://localhost/profile_page/"){
// redirect to logged in users page code here
}
First, if you are using some parameter for your page to build, the url would looks like httlp://localhost/profile_page.php?firstname=alice&lastname=brown, with $_GET['firstname'] you will get alice in this case. If you want to test if the parameter is set first and redirect to another page if it is not set, you could use
if(!isset($_GET['firstname'])
{
header('Location:redirected_page.php');
}
I have several pages which use querystrings to highlight an option in a menu, all the url's on the page have the currant querystring phrased in them so the same menu option will be highlighted on the next page if the user clicks the link.
However the problem arrises when someone visits the page without the querystring included in the url, the menu option isn't highlighted.
What i would like to do is check the URL to see if a querystring is present, if one isnt, create one.
The url's are phrased as such www.mysite.co.uk/Folder1/Folder2/Page.php?id=3
and i would like the default querystring to be ?id=1 if one isn't already present in the url.
Any ideas on how you do this?
And what would happen if a user visits using the URL www.mysite.co.uk/Folder1/Folder2/Page.php?
Would the URL end up as www.mysite.co.uk/Folder1/Folder2/Page.php??id=1
or would it be www.mysite.co.uk/Folder1/Folder2/Page.php?id=1
Thanks,
Maybe there are plenty of ways. You can assign value to $_GET key if one does not exist. Or if you really need to query string, you can renavigate the user to the same page with present querystring.
if (!isset($_GET['id'])) {
header("Location: Page.php?id=1");
exit;
}
It should be before any output in the page. So if user visits Page.php or Page.php? or Page.php?someDifferentParamThanId=10 it will return false on isset($_GET['id']) thus it will redirect to Page.php?id=1
This should work:
if(isset($_GET['id'])){
//It exists
}else{
//It does not, so redirect
header("Location: Page.php?id=1");
}
Do something like:
if(!isset($_GET['id'])){
header('LOCATION:www.mysite.co.uk/Folder1/Folder2/Page.php?id=1'); die();
}
In php, the query string is loaded into $_REQUEST variable. In your case, $_REQUEST['id'] will be equal to 1, 3 or whatever you get in the query string.
For solving the problem when no id is given via GET, I think will be enough to add this line at the beginning of each php page:
<?php
if ( $_REQUEST['id']=='' ) {$_REQUEST['id']=1;}
?>
It is not necessary to change the URL on the fly.
I have a form that submits to the same page. Now when it gets submitted and after it's processed I need it to have a unique query string.
So for example the user inputs some info then clicks submit, then the page saves the info on the server then the server spits it back out with a unique query string for that info.
If I try to set $_SERVER['QUERY_STRING'] it just hangs. Is there another way to do this?
Is it possible with a redirect?
EDIT, I'm going from mysite.com/ and the form action is on mysite.com/ and I want the browser to go to mysite.com/?blah
OK I tried putting this on my the top of my page with no luck
<?php
if ($_POST['data']) header('location: /?' . idFromDifferentFunction() );
?>
but it just keeps loading, I'm guessing it just redirects itself to death.
I hope you now understand what I'm trying to do
Chances are that your script is continuing to run after the code that says it should redirect. You also need to be more precise with the header:
<?php
if (isset($_POST['data'])) {
header('Location: /?' . idFromDifferentFunction() );
exit;
}
?>
If you use the code above, it will make the script exit which dumps the output and the browser will see the redirect (note the capital L in Location).
The key point is the exit following the redirect header. Without it, PHP is very likely going to continue working on whatever other code you're doing in the script.
It's not entirely clear what you're after, but I think you mean you want to go to a page with a unique value in the query string (the bit after the ?) once the processing is complete. Does this unique value need to actually reference something in the system (for a newly-created DB entry does it need to reference the ID of the new entry) or does it just have to be unique?
If it's the latter, you could just generate a random unique ID do the following:
header ('location: /path/to/script?id=' . uniqid ());
If it's the former, then replace the call to uniqid with the value of the database key.
The values in $_SERVER are set at runtime by PHP and should be considered read-only. Changing their values will have no meaningful effect.
$_SERVER['QUERY_STRING'] is part of PHP's globals. You should not be setting those variables, instead set it via a session and return it after submission.
If you are trying to redirect the user to a specific URL then use:
header('Location: mysite.com/bla/bla');
Writing to $_SERVER is pointless. It doesn't affect the client browsers in any way. If you want to change the query string displayed in the client browser, you'll have to use a 301/302 redirect using a header('Location: ...') call.