Custom title when using shortcode

Question

I found this code to have a custom title on WordPress

add_filter( 'pre_get_document_title', 'myFilterTitle', 10, 1);

function myFilterTitle($myTitle) 
{    
    return "$myTitle here";
}

and some of my pages uses this shortcode to create content

function digitSix()
{
      //some codes here;

      $var = "this is custom title";
      apply_filters('pre_get_document_title', $var);

      return $someContent;
}

add_shortcode("i_digit6", "digitSix");

I was able to modify the title but it only gives "here" since it is a hard coded text inside the function myFilterTitle($myTitle)

It seems that the argument $myTitle I passed wasn't captured by the function.

Answer 1

This code solved my problem.

function digitSix()
{
      //some codes here;

      $var = "this is custom title";

      add_filter( 'pre_get_document_title', function( $var ) use ( $var ) {
            return $var;
        }, 20 );

      return $someContent;
}

add_shortcode("i_digit6", "digitSix");