php ?id=

danielneri

ok so whats the function called when someone does

[PHP]index.php?id=something_here[/PHP]

or whats the code for defining the id tag
anyone?

Nuvo

I have no idea what you're asking...
That's just a query string.
Basically, all that does is go to index.php and take some variable values with it.
Defining the value of a query string variable with php is as simple as:
[php]
$var = 1234;
echo "<a href=\"index.php?variable=".$var.">LINK</a>");
[/php]
Once that's done, you can easily get the value of $var on the page linked to by using:
[php]
$var = $_GET;
[/php]
There's no function usage other than echo (or print, which ever takes your fancy) involved, just variable setting and printing.
Of course, on the page you have linked to, you'll want to do something with the variable values sent, but that's up to you to figure out since I have no idea what you're coding, but it's usually a case of:
[php]
if($var == 1234){
//do something here
}elseif($var != 1234){
//do something else
}
[/php]

It's not reccomended that you use query strings for pages which will require that you send confidential data, for that you should use $_POST and firms with the method set to post as it won't show the contents in the address bar.
URL rewriting is also a good thing to look at if you're using query strings as search engines don't like query strings and don't index many pages that use them.

danielneri

ah thanks for your quick reply mate

im trying to make a membership system by myself...

i want to have one page to do all the login/logout/registering functions for me.

so i just have login.php

[PHP]<?php

include 'connect/config.php';
{
session_start()

$_GET["id"];


//Login
if($id == login){

$username = $_POST["username"];
$password = $_POST["password"];

$login = "SELECT username,password FROM members WHERE username='$username AND password='$password'";
$result = mysql_query($login);

//user found, assign variables...
if(!$result)
{
$_SESSION = mysql_result($result,0,"username");
$_SESSION = mysql_result($result,0,"password");
echo "Welcome back $username.";
}

}


//logout
if($id == logout){
session_destroy()
header("Location: index.php");
}

?>


[/PHP]


help me out here please

i want each function to have its own query string
etc. index.php?id=login
index.php?id=logout
index.php?id=register


any ideas?

danielneri

right never mind i fixed it

heres the code i have now for login.php

[PHP]<?php

include 'connect/config.php';
{
session_start();

if($QUERY_STRING == "") {
// Main Page
echo "nothing here...";
} elseif($QUERY_STRING == "login") {
// log in the user
$username = $_POST["username"];
$password = $_POST["password"];

$login = "SELECT username,password FROM members WHERE username='$username' AND password='$password'";
$result = mysql_query($login) or die(mysql_error());

//user found, assign variables...
if(!$result)
{
echo "Welcome back $username.";
}
else
echo "Invalid username/password, please try again.";

}
elseif($QUERY_STRING == "logout") {
// logout the user
session_destroy();
header("Location: index.php");
} else {
// Page not found
echo "Oops.. Page not found (404)";
}

}
?>
[/PHP]


i looked up php query string

that helped alot!
thanks nuvo


i still have one question though, any idea how to put a cookie or session so the user will remain logged in, kind off a remember me feature??

Felix

Ok just a few things to help you. You should consider using switch() in the future instead of using lots of if, else conditional statements.
[PHP]
// Switch example
$var = "1234";
switch($var)
{
// Is var 2222?
case "2222":
// Execute code here if it is!
// Is it equal to 3333?
case "3333":
echo "it is 3333!";
/* Default is exact same as else, meaning if none of the above are true
we execute the following chunk of code */
case default:
echo "foooooo";
}
[/PHP]

Secondly if you want to set a cookie you simply use setcookie() function.
[PHP]
// Example of setting a cookie
$foo = "blaaaaaaaaa";
// Set a cookie called foo with the value of $foo and to last one hour
setcookie("foo",$foo,time() + 3600)
[/PHP]

To check if a cookie exists use the global $_COOKIE array.
[PHP]
// Checks if cookie exists
if(isset($_COOKIE))
{
// Some code here.....
}
[/PHP]

You should only use cookies if you want a remember me feature, in other words users don't login everytime they visit your site.

If you want to remember a user's login just temporarily i.e. until they close their browser, you should consider using sessions. Use the session_start() function to initialise session data and $_SESSION to set or get the value of a session variable.
[PHP]
// Initialise session data.
session_start();

// Set a session
$_SESSION = "foo";
[/PHP]

The above example sets the username foo into the global $_SESSION array. $_SESSION variables can then be used on all other pages. This is a great way of remembering certain data for all your website's pages.

Checking if a session exists is simple..
[PHP]
if(isset($_SESSION))
{
// FOOOOOOOOO
}
[/PHP]

On earlier versions of PHP you need to register a session before it can be used with the session_register() function. Incase you are using any PHP versions before PHP4 you will need to know this!

If you want to remove any session data simply use unset()
[PHP]
unset($_SESSION);
[/PHP]

To destroy a cookie you need to actually reset it but set the expiration date on it to an earlier point!
[PHP]
// destroy a cookie
setcookie("foo",$foo,time() - 3600);
[/PHP]

Thats practically all.

danielneri

amazing felix thanks alot

only one more problem

if i use the switch function, i cant get a query string ex. index.php?login

danielneri

alright guys today if officially the best day of my life!!

i did it!!

i've finally created a fully functional membership, using sessions, all thanks to the extreme help from devdreams!!!

thanks to Felix and Nuvo!!!!

http://www.vipercreations.com/member





p.s. pm if you find a bug please thanks

Python

I just went there and there are no files...

danielneri

yeah sry i moved it to the index, nvm im having problems integrating it into my index...