$_GET and WordPress

I want to add a custom php file to a WordPress to do a simple action.

So far I have in my theme `index.php` file:

<a href="myfile.php?size=md">link</a>

and the php is


<?php echo "hello world"; ?>

<?php echo $_GET["size"]; ?>

<?php echo "hello world"; ?>

The link, once clicked, displays:

hello world

Is WordPress taking over the `$_GET` function and I need to do some tricks to use it? What am I doing wrong?


**Edit**:

<?echo "hello world";?>
<?
if (array_key_exists('size', $_GET))
echo $_GET['size'];
?>
<?echo "end";?>

Ouputs :

hello world

Try this:

<?echo "hello world";?>
<?
if (array_key_exists('size', $_GET))
echo $_GET['size'];
?>
<?echo "end";?>

If you see

hello worldend

... that means you're not setting the size GET parameter. What URL are you using to access said page?

Wordpress does not take $_GET over. Are you sure that you are passing the variable correctly?

If you hardcode the variable in a url, make sure it is of this form:

YOUR_SITE_PATH/?variable_name=variable_value

please not the "/" at the end of the url, before the "?"

I cannot see your index.php code, but make sure that the variable "size" is either set manually in the url or from a submitted form. If you use a form, make sure that you use the method="GET". If you use method="POST", then your variable will be in $_POST['size'].

Hope this helps.

You may want to take a look at WP's documentation about the WP Query object.

[To see links please register here]

It seems like wordpress uses the get_query_vars to method of the wp_query object to get queries.

You may also take a look at this one:

[To see links please register here]

Not sure if this will show anything but try turning on error reporting with:

<?php
error_reporting(E_ALL);
ini_set('display_errors', true);
?>

at the top of your page before any other code.

**Edit:**

From the OP comments:

> silly question, but are you sure you
> are viewing the results of your latest
> changes to the file and not a cached
> copy of the page or something? Change
> "hello world" to something else.
> (Sorry grasping at straws, but this
> happened to me before) – Zenshai
>
> ahaha, the person that
> were doing the changes didn't changed
> the correct file. It's working now –
> marcgg
>
> peer programming fail ^^ – marcgg
>
> That would be an "or something",
> can't tell you how many times i've
> done something like that. Glad you
> were able to figure it out in the end.
> – Zenshai

I usually discover errors like these only when they begin to defy everything I know about a language or an environment.

Although it is quite old post it might be of good use to let know.... There is one plugin that can ease handling of $_GET, $_POST and global variable declaration issues pretty well. [

[To see links please register here]

][1]


[1]:

[To see links please register here]

May be this can somebody

Please check your htaccess file. and have a rewrite rule there

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase <<relative_url>>/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . <<relative_url>>/index.php [L]
</IfModule>
# END WordPress

Please change << relative_url>> with the relative url as compared to your domain

I faced the same issue and my wordpress was installed on a godaddy server . But after changing the .htaccess file the issue got resloved.

See the solution :

In order to be able to add and work with your own custom query vars that you append to URLs, (eg: `www.site.com/some_page/?my_var=foo` - for example using `add_query_arg()`) you need to add them to the public query variables available to `WP_Query`. These are built up when `WP_Query` instantiates, but fortunately are passed through a filter `query_vars` before they are actually used to populate the `$query_vars` property of `WP_Query`.

For your case :

function add_query_vars_filter( $vars ){
$vars[] = "size";
return $vars;
}
add_filter( 'query_vars', 'add_query_vars_filter' );

and on your template page call the get methode like that :

$size_var = (get_query_var('size')) ? get_query_var('size') : false;
if($size_var){
// etc...
}


**More at the Codex** : **http://codex.wordpress.org/Function_Reference/get_query_var**

I hope it helps !