apply_filters( ‘the_title’, string $post_title, int $post_id )

User Contributed Notes

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   Steven Lin 4 years ago

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   Suppressing the title in templates for all posts in the “blurb” category:

   function suppress_if_blurb( $title, $id = null ) {
   
       if ( in_category(' blurb', $id ) ) {
           return '';
       }
   
       return $title;
   }
   add_filter( 'the_title', 'suppress_if_blurb', 10, 2 );

   Note the addition of null as the default value for the $id variable. This is because some instances of the usage of this filter did not supply a post ID. This inconsistency was introduced in version 3.1, and fixed in version 3.3 (see ticket #16688). If you want to be compatible with these older versions, you need to supply the default value as above, or you will end up with a PHP warning stating that you are missing an argument. If you don’t need to support 3.1 or 3.2, it isn’t necessary to specify a default value for $id.
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   Chigozie Orunta 2 years ago

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   Render capitalised post titles across your site like so:

   add_filter( 'the_title', 'wpdocs_capitalise_post_titles' );
   
   function wpdocs_capitalise_post_titles( $title ) {
   	return ucwords( $title );
   }