This may seem like a silly question but I cannot figure this out.

I've created a variable in my functions.php - and I'm trying to echo it in my template files.

I'm guessing it's because of scope.

What's the simpliest what to echo a variable or create a function to allow me to output this facebook ID in various template files.

This is what I've currently got in my functions.php...

$fb_app_id = '68366786876786';

And this is how I was trying to echo it...

<?php echo $fb_app_id; ?>

Any ideas would be hugely helpful, thanks you very much

closed as off topic by Chip Bennett, Milo, kaiser, Rarst Jul 15 '12 at 22:28

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  • 1
    Close-voted as off-topic. This is a programming/PHP question, not a WordPress question. – Chip Bennett May 4 '12 at 15:53
  • Use global $your_var; echo $your_var; or echo $GLOBALS['your_var'];. – kaiser May 4 '12 at 16:33

If you don't have access to the value, it's likely a scope issue. Make sure you globalize it first:

global $fb_app_id;
echo $fb_app_id;


I'm not a fan of global variables, so the alternative I recommend is using WordPress' built-in filter mechanism. You add the filter in your functions.php file and apply it where needed.

In functions.php:

add_filter( 'fb_app_id', 'return_fb_app_id' );
function return_fb_app_id( $arg = '' ) {
    return '68366786876786';

In your template files:

echo apply_filters( 'fb_app_id', '' );

Or use an action hook

In functions.php

add_action( 'fb_app_id', 'echo_fb_app_id' );
function echo_fb_app_id() {
    echo '68366786876786';

In your template files:

do_action( 'fb_app_id' );

Whether you use an action hook or a filter is entirely up to you. I recommend a filter because it can return a value. This is far more flexible than just injecting echo calls in your template.

  • 1
    Upvote for the filter based method. Much cleaner. – Rutwick Gangurde Mar 3 '16 at 9:01

I would use Wordpress options in this case. You can set an option using either add_option() or update_option() (probably better for your case). You would use update_option('fb_app_id', '68366786876786'); somewhere in you're functions.php file (the init hook function would probably be a good place).

You could then show this option in your theme files using echo get_option('fb_app_id');

The reason I would suggest this way, rather than using globals (ick) or action/filter hooks is that if you plan on releasing your theme to the public, it will be much easier to make fb_app_id an editable option in a theme options page.


the easiest way would be to just create a callable function, you don't really need a hook here

function get_fb_app_id() {
    $fb_app_id = '68366786876786';
    return $fb_app_id;

and in the template:

echo get_fb_app_id();
  • A wrapper function to return a global var?? – kaiser May 4 '12 at 16:33
  • no, i wouldn't set it to global, that's why i didn't add the global line. – fischi May 5 '12 at 14:10
  • Ok. So why isn't it inside the function? Currently the function would just throw an Error: undefined (...). – kaiser May 6 '12 at 15:09

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