Insert Code into Header Only on Blog Posts

Question

Is there a way to put some code into the header but have it load only on blog posts?

Maybe a plugin or a piece of code that could help me accomplish this?

Answer 1

Yes. In your functions.php file, add something like the following:

function my_post_header_function() {
   if( is_single() ) {
      // Your Code Goes Here
   }
}
add_action( 'wp_head', 'my_post_header_function' );

What this will do is execute this when wp_head() is fired. It will see if you're on a single post (NOTE: This will not work on pages or attachments) and if you are, it will execute the code you want to put.

Answer 2

You could create another header called header-blog.php

Then on your blogs template replace the

 <?php
    get_header();
?>

with

  <?php
if ( is_home() ) :
    get_header( 'blog' );
else
    get_header();
endif;
?>

I know is_home is slightly confusing but this is what wordpress looks for as a blog page

also see https://codex.wordpress.org/Function_Reference/get_header