WordPress the_title Filter Hook Generically and Semi-uniquely

I ran into a situation where I needed to apply a callback function to the_title filter hook in WordPress. I thought this would be a simple task. After creating my callback function and assigning it to the the_title filter hook, I thought it did exactly what I needed it to do. Except, then I noticed it was also applying the same filter to navigation items as well. Thus, breaking the layout.

How can I target the the_title filter hook while ignoring the filter effect for navigation items?

I was working on a section in a WordPress theme which I wanted to add buttons to the page title within the heading one tag.

It looked similar to this:

I was then “hooking in” like this:

However, the above targets literally everything which calls the_title filter hook, and this includes navigation items.

I changed the filter hook definition like this:

Pretty much every call to the_title filter passes parameter 1 as the $post->post_title and parameter 2 as the $post->ID. Search the WordPress core code for apply_filters( 'the_title'* and you’ll see for yourself.

So I decided to add a third parameter for situations where I want to target specific items which call the_title filter. This way, I can still receive the benefit of all callbacks which apply to the_title filter hook by default, while also having the ability to semi-uniquely target items that use the_title filter hook with the third parameter.

It’s a simple boolean parameter:

Label the variables however you want. This is what worked for me, and it does exactly what I need it to do.

Hope this helps someone in a similar situation.

Credits

Original question asked by @softsdev on stackoverflow: Why the_title() filter is also applied in menu title?
Answer to Question: Why the_title() filter is also applied in menu title? by @Michael Ecklund on stackoverflow.

Related Questions

This article assists in answering all of the following related questions:

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