Issue when using in header.php

[E-VANCE]

First of all: Great approach you have chosen here, perfectly fits my workflow using ACF and came in very handy for setting responsive fullpage-background images, very much appreciated.

I ran into an issue when trying to call waldo in my header.php – the variable is marked as undefined and thus it breaks the page. Pretty sure this has to do with the load-order / initialization since it works fine when using the same code in a regular page.php-template.

My theme (Sage) calls head.php first which contains wp_head(); and my header.php follows which means that add_action('wp_head', 'init_waldo', 99); should be correctly registered / called upon beforehand...? Raising the priority didn't help.

My workaround is to call waldo in the page template while the corresponding background-div can still reside in header.php but I wanted to ask why you think this might be happening.

Thanks!

[peterwegren]

Hey @E-VANCE, thanks for the kind words! I'm glad Waldo has been workable solution for you.

I've looked into this, and as far as I can determine, WordPress doesn't allow implicit global variable access within the header.php and footer.php files.

The solution to this is to explicitly declare/pull-in the globals that you are trying to access at the beginning of the include/theme file that is having problems accessing the variables.

This may be done by including: global $waldo, $waldo_styles; or $waldo = $GLOBALS['waldo']; $waldo_styles = $GLOBALS['waldo_styles'];.

From there, you should be able to proceed with the code as per the documentation example.

[E-VANCE]

Thanks for getting back and updating the README accordingly! Sorry for the late reply, the issue somehow slipped my mind after I got things working...