I have a page that will show multiple content, depending on what ID the user has in their URL.
e.g:-
If they have accessed https://stackoverflow.com/#cars - I want to show cars only.
If they have accessed https://stackoverflow.com/#trains - I want to show trains only.
I would like to do this in PHP, as I do not want the other information displayed.
I have tried the following, but with no luck:-
<?php
$url = 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];
if (strpos($url,'cars') !== false) {
echo 'Car exists.';
} else {
echo 'No cars.';
}
?>
Can anyone please help?
The # part of a URL is an instruction to the browser to navigate to that element of the page as soon as it loads. It's never sent to the server.
If you want to pass information to the server then use query parameters e.g. https://www.example.com?section=trains and then you can use $_GET["section"] in PHP to retrieve the submitted value.
But as someone has noted in the comments, that's a generic way to do this in a web/PHP context, however Wordpress probably has better methods built in to accomplish the specific filtering task you're interested in here.
Related
I want to have a navigation bar that tells the user where they just came from.
Example: Homepage -> Post
But if they are in their posts manager and click on a post, I want it to say
Posts manager -> Post
I read that $_SERVER['HTTP_REFERER'] is not good enough to get the full url so that's not useful as I want the navigation bar all clickable
Any help is much appreciated!
I believe what you want is called breadcrumbs.
What to use for navigation chain storage is actually up to you. You might use even $_SERVER['HTTP_REFERER'] if you want, but that'd be unreliable as it's client-side. Usual way to store such chain is actual URI or session.
For example, you have such URI: http://www.example.com/post_manager/post
Then you can iterate through explode("/", $_SERVER["REQUEST_URI"]) to get each step.
That's basic explanation to guide you to a right direction. You can google alot of samples and snippets using keyword breadcrumbs.
On the topic of saving last visited location (the way to determine wether abonent came from manager or homepage): you can use session's variables to do that. Here's an example:
This way you can set a variable on your homepage:
<?php
session_start();
$_SESSION['previous_location'] = 'homepage';
?>
And then you just access it from another page:
<?php
$previous_location = $_SESSION['previous_location'];
?>
It's important to set session.save_path in your PHP configuration file or your sessions might get lost.
You could do it on the client side if you use the Javascript document.referrer property. However, a better solution may be to use the global session array.
if (!isset($_SESSION['referrer'])) {
$_SESSION['referrer'] = $current_uri;
} else {
$previous_uri = $_SESSION['referrer'];
$_SESSION['referrer'] = $current_uri;
}
The best solution IMO is to save the location into session, every time the user goes to a 'meaningful' page (that you want to be able to navigate back to via this feature), then simply use this array of, say, last 2 visited pages to pull up all the information. Simple and effective.
<?php
session_start();
$_SESSION['user_interactions'][] = $_SERVER['HTTP_REFERER'];
// get previous
$previous_page = end($_SESSION['user_interactions']);
// list all user interactions
foreach($_SESSION['user_interactions'] as $key => $value){
echo $value;
if(count($_SESSION['user_interactions'])-1 != $key) echo ">";
}
?>
I have several folders on my domain, within each folder contains an index.php file that checks to see if the database connection passes or fails, if it fails, the page is redirected to a top level file (outside of all folders) called offline.php. This part works great. The basic format I'm using to redirect if the db is offline is:
if ( !$dbconnect ) {
header("Location: https://www.test.com/offline.php");
}
Then, within the offline.php page, I need to check to see which folder brought the user to the offline.php page, and display a unique message to the user - based on the folder that brought them to the offline.php page.
For example:
test.com/test1/index.php redirects to offline.php, the message would say 'test1 brought you to this page'
test.com/test2/index.php redirects to offline.php, the message would say 'test2 brought you to this page'.
In multiple browsers I've tried the following code, which always results in 'unknown uri':
$url = 'https://' . $_SERVER['HTTP_REFERER'] ;
if ( strpos($url,'test') !== false ) {
echo 'test';
} elseif ( strpos($url,'test1') !== false ) {
echo 'test1';
} elseif ( strpos($url,'test2') !== false ) {
echo 'test2';
} else {
echo 'unknown uri';
}
Suggestions?
EDIT
Due to the unreliable nature of HTTP_REFERER I've decided to put all of the conditions within the index.php page and forget about the offline.php page. A HUGE thank you to everyone who offered suggestions!
Why would you use redirects at all? They are heavy on the server, slow and just plain old unnecessary. Use a switch statement and have 1 controlling page instead of multiple folders and pages.
If you use the following code on your offline.php page, you can see all of the $_SERVER variables available (referring URL is in there)
echo '<pre>',print_r($_SERVER),'</pre>';
From there, you can take $_SERVER['HTTP_REFERER'] use a select case, or if then statement and accomplish your goal.
Based on some of your questions in the comments and people pointing out the use of $_SERVER['HTTP_REFERER'] being unreliable, you could do something like this instead.
On your index.php page with the dbconnect check, you could modify it to be something like this. header("Location: https://www.test.com/offline.php?org=".urlencode($_SERVER['REQUEST_URI']));
Then, on the offline.php,
$page = urldecode($_GET['org']);
$org = explode('/',$page);
echo $org[1] to get the first value after the slash, $org[2] would get the next value etc..
I need to link to a specific page in my Facebook app. The app is not in a page tab, and cannot be in one due to the project constrictions.
This is the url format:
https://apps.facebook.com/myappname
I would need to pass a parameter at the end (like /next.html or ?page=next) so that I can link to the specific page directly from outside the app (from an email).
How would I set this up? My project uses PHP and jQuery. I would love to be able to do this strictly in Javascript if possible.
I have found tons of info on how to deep link a page tab or a mobile app, but not to a regular application. I have found messages stating it's possible, but nothing about how to actually do it anywhere online or on Facebook.
Thanks for your help.
EDIT:
Okay, I got it working in PHP. For anyone else with this issue, this is what I did.
Add a "?" at the very end of the 'Site URL' in your FB app, then create a redirect file similar to this as your app landing page (just use absolute paths instead of relative ones like I did below):
<?php
$query = $_SERVER['QUERY_STRING'];
$params = explode("/", $query);
if (in_array("gallery", $params)) {
header("Location: /gallery.html");
exit;
}
else {
header("Location: /index.html");
exit;
}
?>
This answer is what helped me figure this out:
$_GET on facebook iframe app
I may be missing something here, but why don't you just link to http://apps.facebook.com/yourapp/something.php - this should automatically load your canvas URL, with something.php appended to the path
Obviously this won't work if your canvas URL points to a specific file and not a directory, but plenty of apps do this with success
When you are using the ? all you are doing is issuing a $_GET request, so all of the info you require will exist in the $_GET array.
Rather than query the $_SERVER array, query the $_GET array.
So if you had:
http://myurl.com?info=foobar
You can simply access that info using:
$info = $_GET['info'];
It is good practice to check for the existence first though:
if (isset($_GET['info']))
{
$info =$_GET['info'];
}
else
{
$info="default";
}
Incidently if you use the & character you can have multiple parameters:
http://myurl.com?info=foo&moreinfo=bar
You get a special parameter called app_data that you can use however you want. I've used it in the past to encode a full querystring of my internal app. for example, &app_data=My/Custom/Page
More found in this SO question: Retrieve Parameter From Page Tab URL
Let say we've the following
Objective : User will post certain exact URL $refere to lock viewing text content and only be allowed for view if the viwer is coming from the same exact URL $refere.
$refere = "http://www.site_site.com"; // User will post it
$r = $_SERVER['HTTP_REFERER']; // To get real referral
and i want to do the following
<?PHP
if(stripos($r, $refere) == false){
echo "Wrong";
} else { ?>
echo "Go";
}
?>
It always gives me $r = $_SERVER['HTTP_REFERER']; blank ! so does it deprecated on any PHP version 4 or 5 whatever !
Also
what is the user posted $refere like https:// or missed www. or only posted site_site.com while the $r = $_SERVER['HTTP_REFERER']; showing www.site_site.com
so can anyone help me to adjust this code to be working fine no matter the user posted the $refere link fully or only site_site.com.
The $_SERVER['REFERER'] variable will only be set when you click a link to your page from another page and if the browser (or an eventual proxy or firewall you're on) isn't removing the referer header.
To your second question: do some string comparisons. The functions strpos() and substr() will be of great help.
I am trying to hide my websites cms application...
So i thought i would add a bit of php to any random page on my site, that includes a GET referance to some random string... So basically, if you go to x page, and add ?RANDOMSTRING the cms index is included. This is stored above the web root... Here is the peice of php:
if (isset($_GET['J7sd-H3sc9-As3R']))
{
require_once($docRoot . '/../../includes/admin/index.php');
}
Basically, index.php is laid out as a page with 3 fieldsets. In the 3 field sets are various links relating to various applications that deal with various tasks. They were accessed through the same means as the above code. And they were held in the web root and were able to be accessed via http...
That all worked perfectly fine, But the problem now comes when i try to access any specific part of the cms...so what would have been:
http://www.mysite.com/admin/part/
is now:
include($_SERVER['DOCUMENT_ROOT'] . '/../../includes/admin/part/index.php');
Or something of the sort...
So now when i go to my page at
http://www.mysite.com/randomDirectory/
and add:
http://www.mysite.com/randomDirectory/?J7sd-H3sc9-As3R
I get sent to my cms... Cool... But when i try to click on any section i get this header:
http://www.mysite.com/randomDirectory/?part
and the page gets refreshed to:
http://www.mysite.com/randomDirectory/
If that makes sense...
Could any provide me with any input or suggestions regarding the task that i am trying to accomplish? I am not sure if it is even possible to start off with, but it seems simple enough.
Any replies would be greatly appreciated, Thanks!
I guess you should append at the end of every link in your page something like
<?php if (isset($_GET['J7sd-H3sc9-As3R'])) echo '?J7sd-H3sc9-As3R'; ?>
Example:
http://www.mysite.com/randomDirectory/randomPage<?php if (isset($_GET['J7sd-H3sc9-As3R'])) echo '?J7sd-H3sc9-As3R'; ?>
edit
An easier way to do this would be to use sessions, in this way:
<?php
session_start();
if (isset($_GET['J7sd-H3sc9-As3R']))
{
$_SESSION['token'] = 'J7sd-H3sc9-As3R';
}
if (!isset($_SESSION['token']) || $_SESSION['token'] !== 'J7sd-H3sc9-As3R')
{
exit;
}
// go on with your page
?>
In this way, when you open a page with your token in the url, the session is started and the token is saved in the session, so it should work without the need to insert the token in every url until you close your browser.