Hey folks,

Just a quick question, i havent coded for a while so i cant remember how to do the following in php...

I see websites with pages like index.php?next_page blablabla...
Can anyone either point me to a link or tell me how? thanks.

You mean like a query string?

code:

---

index.php?x=1&y=0

---

php code:

---

<?php

    echo $_GET['x'].'<br />'.$_GET['y'];

?>

---

That's done something using "$_GET" to create check against a variable...

In php, you have assign variables to the end of the url and then call them back using the global variable $_GET, so to create an easy include function, you would have your links changing that variable, and a block of code to check what that variable is, so for example, if we had the variable "page" and the includes 1.php and 2.php and the variables for those pages being "one" and "two" respectively, we would have the big block of code to check what the variable is:

php code:

---

$page = (isset($_GET['page'])) ? $_GET['page'] : "";
   
if($page=="" or $page=="one"){
    include("1.php");
}
elseif($page=="two"){
    include("2.php");
}

---

php code:

---

<a href="?page=two">goto page 2</a>

---

quote:

---

Originally posted by methos
That's done something called the "get" function...

In php, you have assign variables to the end of the url and then call them back using the GET function, so to create an easy include function, you would have your links changing that variable, and a block of code to check what that variable is, so for example, if we had the variable "page" and the includes 1.php and 2.php and the variables for those pages being "one" and "two" respectively, we would have the big block of code to check what the variable is:

php code:

---

$page = (isset($_GET['page'])) ? $_GET['page'] : "";
   
if($page=="" or $page=="one"){
    include("1.php");
}
elseif($page=="two"){
    include("2.php");
}

---

This uses the GET function and sets the variable $page to the value that has been set in the URL (for example www.bbq.com?page=one would mean the variable page is set to one), then checks what the variable is, and if the variable is one or not set then it includes 1.php and if the variable is two it includes 2.php.

To change this variable (ie, when you click a link) you use the following code:

php code:

---

<a href="?page=two">goto page 2</a>

---

This is a self-explanatory line of code.

This method can also be used to string variables and can be incredibly useful. To string variables, you just set the variables in the same way. If you need any more help feel free to post

---

Be careful though when you do that, because malicious users can use this to load arbituary code. bbq.com?page=./../passwords.txt would allow a user to load a file that normally wouldn't be able to load, or even bbg.com?page=http://malicioussite.com/badpage.php

Use a regex to filter these out, make sure the file exists, or even better us an associative array. bbq.com?page=1 loads one.php as an example

I dont think you guys are quite following me with what i want now

I want a main index.php page. Where the page itself remains exactly the same and only the "main" area of a page, that is selected is changed with the contents of another .php file or .html file etc.

Sort of like an iframe i suppose, but in PHP.

Hope you understand.

quote:

---

Originally posted by Eddie
That method is relatively similair to what i've used before, but before, all you had to do was list the different page names, link to the directory the files were in and it would then present them files in a similair fashion to how you did it, hope you understand.

---

code:

---

<a href="?page=include.php">linkage</a>

---

code:

---

$llama = $_GET['page'];

include ($llama);

---

quote:

---

Originally posted by MeEtc
malicious users can use this to load arbituary code. bbq.com?page=./../passwords.txt would allow a user to load a file that normally wouldn't be able to load, or even bbg.com?page=http://malicioussite.com/badpage.php

---

Yeah the method i used to use followed the logic from your first page, but instead of having seperate variable things like you have, you had all your page names.

So for example, we used to use a random format, for our old site we used .hz. So in the php code we would have it realising the format name, posting it like any other include but only reading the page names from 'test', 'test1', 'test2' which it would realise are test.hz, test1.hz and test2.hz, and it would show as index.php?p=test or index.php?p=test1

Your original post does this, but in a way that is slightly different and not completely how i wanted.

quote:

---

Originally posted by Eddie
Yeah the method i used to use followed the logic from your first page, but instead of having seperate variable things like you have, you had all your page names.

So for example, we used to use a random format, for our old site we used .hz. So in the php code we would have it realising the format name, posting it like any other include but only reading the page names from 'test', 'test1', 'test2' which it would realise are test.hz, test1.hz and test2.hz, and it would show as index.php?p=test or index.php?p=test1

Your original post does this, but in a way that is slightly different and not completely how i wanted.

---

php code:

---

$extension = ".hz";
$llama = "$_GET['page']"."$extension";

include ($llama);

---

php code:

---

$extension = ".hz";
$llama = "$_GET['page']"."$extension";

if(file_exists($llama) == TRUE){
include ($llama);
}
elseif(file_exists($llama) == FALSE){
include("error.php")
}

---

html code:

---

<a href="?page=page1">page one</a>

---

php code:

---

$dir = "./some/file/dir"; //extra line to define dir
$llama = "$dir"."$GET_['page']"."$extension"; //new $llama line

---

php code:

---

$extension = ".hz"; //sets the extension variable

//this two line section defines the two variables included in the URL, you don't have to do this - you could just substitue the variables in the $llama variable for the values defined here, but this way it shows it nice and clearly and allows for explanation and comments...
$username = $_GET['user'];
$page = $_GET['page'];

//the directory that the username folders will be in
$dir = "./data/users/";

//defines the path of the file to include in the following format: directory-user-folders-are-in/user-folder-name/page-to-include.extension
$llama = "$dir"."$username"."$page"."$extension";

//checks whether this file exists, if it does include it, if it doesnt include the page error.php
if(file_exists($llama) == TRUE){
include ($llama);
}
elseif(file_exists($llama) == FALSE){
include("error.php")
}

---

Now THATS what im after, thank you very much You've been of great help

+1

quote:

---

Originally posted by Eddie
Now THATS what im after, thank you very much You've been of great help

+1

---

You might wanna also use a .htaccess file to disallow access to all the files in $dir.

Another question, how would i go about including different directories, i understand what you said, but then your llama output only allows for one directory.

For example i have the following directories.
/page/info/
/page/users/
/page/resources/

Using your method above how would i do this? If its not possible i will just combine all the pages, but yeah.

Also further questions, if anyone knows PHP/MySQL information...

What i'm making is a Virtual Airline for a friend of mine and myself, i am very bored at the moment incase you wish to know, but anyway...im creating a routes table on my database and what i want to happen is;

On my routes page the url will look like http://www.address.com/index.php?page=routes

And of course on that page there will be a table listing all the routes, that are to be grabbed from my database and sorted by "FlightID". For example i have a flight AAA123 in the table, i want the FlightID to be a link to a page like the following;

http://www.address.com/index.php?page=routes&flightid=AAA123

And i want this to occur to every row for each FlightID.

(On a note to the above, it would be even better, if that link would load up a generic page but with the correct FlightID in the url, which it loading all of the data from the AAA123 row in my database.)

Next up is a submit report page, im having a little trouble with it, ive at the moment got it working on seperate pages for each FlightID, which is quite an effort, but isnt really very convenient if i wished to change them.

What will happen is, on the page;
http://www.address.com/index.php?page=booked_flights&flightid=AAA123

There will be a link to File a Pirep. Is it possible to make that link open a new generic page, which will automatically fill in data from the AAA123 row of my database as part of a form, but also allowing user-input, if you don't understand i will upload an example to my website so you can see what i mean.

Sorry if it doesnt make sense, im trying to explain the best i can what i need, it has been a while since i coded like this so im just having a bit of trouble getting it "on to paper".

quote:

---

Originally posted by Eddie
Another question, how would i go about including different directories, i understand what you said, but then your llama output only allows for one directory.

For example i have the following directories.
/page/info/
/page/users/
/page/resources/

Using your method above how would i do this? If its not possible i will just combine all the pages, but yeah.

---

php code:

---

$page = $_GET['p'];
$llama = "./page/"."$page".".hz";

if(file_exists($llama) == TRUE){
include ($llama);
}
else{
include("error.php")
}

---

html code:

---

<a href="?page=info/file">link</a>

---

quote:

---

Originally posted by Eddie
On my routes page the url will look like http://www.address.com/index.php?page=routes

And of course on that page there will be a table listing all the routes, that are to be grabbed from my database and sorted by "FlightID".

---

code:

---

SELECT FlightID, FlightName, FlightDate FROM news ORDER BY FlightID ASC

---

quote:

---

Originally posted by Eddit
For example i have a flight AAA123 in the table, i want the FlightID to be a link to a page like the following;

http://www.address.com/index.php?page=routes&flightid=AAA123

---

code:

---

SELECT * FROM FlightTable WHERE FlightID=$FlightID

---

php code:

---

if(file_exists($llama) == TRUE){
include ($llama);
}
elseif(file_exists($llama) == FALSE){
include("error.php")
}

---

php code:

---

if(file_exists($llama) == TRUE){
include ($llama);
}
else {
include("error.php")
}

---

quote:

---

Another way of doing it so you don't end up filling the url with messy slashes (and possibly confuddling your browser)

---

quote:

---

Originally posted by segosa

You seem to know what you're doing, so why do you write code like this? ...

---

quote:

---

Originally posted by segosa

php code:

---

if(file_exists($llama) == TRUE){
include ($llama);
}
else {
include("error.php")
}

---

quote:

---

The == TRUE part also may as well as be removed as file_exists returns a boolean value...

php code:

---

if(file_exists($llama)){
include ($llama);
}
else {
include("error.php")
}

---

---

---

code:

---

<div id="content">
    <?
      $page = GET['p'];
      $llama = "./page/"."$page".".mdu";
      if(file_exists($llama) == TRUE){
          include ($llama);
      }
      else{
          include("error.php")
      }
?>
    </div>

---

do you have any previous php code? because you could have an error there... also i see that there is no ; on the include("error.php")


edit: you need to change the line that is erroring to $_GET['p'];

also to highlight a line in code you can use

>>> the text you are wanting to highlight <<<

in the code tags

quote:

---

Originally posted by Eddie

code:

---

<div id="content">
    <?
      $page = GET['p'];
      $llama = "./page/"."$page".".mdu";
      if(file_exists($llama) == TRUE){
          include ($llama);
      }
      else{
          include("error.php")
      }
?>
    </div>

---

Is returning the following error;

Parse error: parse error in C:\xampp\htdocs\vabase\main.php on line 29

Line 29 is "$page = GET['p'];"

---

php code:

---

<div id="content">
<?php
$page = $_GET['p'];
$llama = "./page/".$page.".mdu";
if(file_exists($llama)) {
  include($llama);
}
else {
  include("error.php");
}
?>
</div>

---

quote:

---

Originally posted by davidpolitis
I changed the PHP opening to "<?php" because short tags (<?) need to be enabled on whatever server you decide to upload to.

---

quote:

---

Originally posted by NanaFreak

quote:

---

Originally posted by davidpolitis
I changed the PHP opening to "<?php" because short tags (<?) need to be enabled on whatever server you decide to upload to.

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this is not always the case, my host (hostgator) has short tags enabled by default, and really all hosts should (unless its a free host or something)

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quote:

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Using short tags is discouraged when developing code meant for redistribution since short tags may not be supported on the target server.

---

quote:

---

Originally posted by davidpolitis

quote:

---

Originally posted by segosa

php code:

---

if(file_exists($llama) == TRUE){
include ($llama);
}
else {
include("error.php")
}

---

---

The == TRUE part also may as well as be removed as file_exists returns a boolean value...

php code:

---

if(file_exists($llama)){
include ($llama);
}
else {
include("error.php")
}

---

---

quote:

---

Originally posted by davidpolitis

quote:

---

Originally posted by segosa

php code:

---

if(file_exists($llama) == TRUE){
include ($llama);
}
else {
include("error.php")
}

---

---

The == TRUE part also may as well as be removed as file_exists returns a boolean value...

php code:

---

if(file_exists($llama)){
include ($llama);
}
else {
include("error.php")
}

---

---

php code:

---

if(file_exists($llama))
    include ($llama);
else
    include("error.php");

---

quote:

---

Originally posted by Felu

php code:

---

if(file_exists($llama))
    include ($llama);
else
    include("error.php");

---

---

quote:

---

require() is identical to include() except upon failure it will produce a fatal E_ERROR level error. In other words, it will halt the script whereas include() only emits a warning (E_WARNING) which allows the script to continue.

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