This is a generic PHP question, but simple to answer. The problem is most likely caused by PHP 7. Simply change the line: $callback[0]->$callback[1](); to $callback[0]->{$callback[1]}(); This is because $callback[0]->$callback[1](); means $callback[0]->{$callback[1]}(); in PHP5, while it means ($callback[0]->$callback)[1](); in PHP7. Take a look into this page to know the details about the change.
Changing layout programmatically
Define it in functions.php, which is loaded on every request. However, there are far better options than a global variable: a function a template part if it’s a template you’re defining filters
Your best bet is to rename the old header.php to header.bak.php and your new copy to header.php. header.php (there’s only one such file, always) is called from the other theme templates using get_header(). What you could/eventually should do, if you don’t want to directly edit the existing theme, is set up a child theme, copy … Read more
First, let’s take a look at your code with some comments to show what’s happening. /** * Adds the function “set_templates” to the “template_include” filter with a * prioritiy of 99 (default is 10). * * What this means is that whenever WordPress runs the filter “template_link”, * your function “set_templates” will be called and … Read more
I’m not sure if I get you right, but if so, this will solve your problem: <?php $classes = array(); $subjects = get_the_terms( get_the_ID(), ‘subject’ ); $categories = get_the_terms( get_the_ID(), ‘category’); if ( count($terms) > 1 ) { $classes[] = “reset”; } else { foreach ($subjects as $term ) { $classes[] = $term->slug; } } … Read more
You can use the save_post action to do it. I think its better than the other option to check everytime the page load because it won’t effects your clients and will not run everytime the page load. Also you need to check if its the post parent its the one that saved so you will … Read more
The way I would organise this (and I have done this in the past) would be to have a post type for Work Sites, and a hierarchical taxonomy for Locations. Then what you would do is add States as the top-level of the Locations taxonomy, and then add Cities as children of the State locations. … Read more
Is there a way to create a block template that is not limited to a post type?
How to preserve changes in templates and other files