get_template_part_content for Single Posts

I’ve been looking for a non-intrusive way to insert text before any of my WordPress Single Posts and Pages. In the past, I modified the themes directly, but since I didn’t own the themes I was using, anytime I updated the theme, I would lose all my changes.

I had found I can insert text at the top and bottom of my pages using add_action. For example:

add_action( 'get_footer', 'echo_hello_world' );

function echo_hello_world( $post )
{
   echo "hello world";
}

would add the phrase “hello world” to the bottom of every single page on my blog. You can find a list of tags on WordPress’ Action Reference page.

One of the things I wanted to do was insert some text beneath my header, but before my post. I had found get_template_part_content would do the trick on Pages, but not Single Posts. After I failed at finding a solution online, I looked into how the code differed between Pages and Single Posts.

Single Posts were calling:
get_template_part( 'content-single', get_post_format() );

while Pages were calling:
get_template_part( 'content', 'page' );

So I wondered if get_template_part_content_single would work, but nothing happened. I then tried get_template_part_content-single, lo and behold, it WORKED! Given that Google has 0 search results with that exact phrase, I’m guessing no one’s discovered this action tag or at least posted about it publicly.

So my code ended up looking like:

add_action( 'get_template_part_content', 'echo_hello_world' );
add_action( 'get_template_part_content-single', 'echo_hello_world' );

function echo_hello_world( $post )
{
   if( is_single() || is_page() )
   {
       echo "hello world";
   }
}

As a bonus, here’s a tag you can use to insert text between your post and the comments section: comments_template

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