#8: get_the_generator_{$type}

get_the_generator_type.php

<?php
/**
 * WordPress versions to jazz musicians
 *
 * @param string $gen The generator meta tag.
 * @param string $type The type of page to generate the tag for.
 *
 * @return string The filtered generator meta tag.
 */
function wpdocs_generator_as_jazzer( $gen, $type ) {
	// Jazz musicians to their respective release versions
	// The leading space in the verisons are to avoid
	// false positives from point releases in the strpos().
	$jazzers = array(
		' 1.0' => 'Miles Davis',     ' 1.2' => 'Charles Mingus',
		' 1.5' => 'Billy Strayhorn', ' 2.0' => 'Duke Ellington',
		' 2.1' => 'Ella Fitzgerald', ' 2.2' => 'Stan Getz',
		' 2.3' => 'Dexter Gordon',   ' 2.5' => 'Michael Brecker',
		' 2.6' => 'McCoy Tyner',     ' 2.7' => 'John Coltrane',
		' 2.8' => 'Chet Baker',      ' 2.9' => 'Carmen McRae',
		' 3.0' => 'Thelonious Monk', ' 3.1' => 'Django Reinhardt',
		' 3.2' => 'George Gershwin', ' 3.3' => 'Sonny Stitt',
		' 3.4' => 'Grant Green',     ' 3.5' => 'Elvin Jones'
	);
	foreach ( $jazzers as $version => $name ) {
		if ( strpos( $gen, $version ) )
			$jazzer = $name;
	}
	if ( empty( $jazz ) )
		$jazzer = 'Jazz';

	// Outputs 'WordPress to the sounds of [Musician] or Jazz'
	$jazzer = sprintf( esc_attr__( 'WordPress to the sounds of %s', 'yourtextdomain' ), $jazzer );

	return '<meta content="' . $jazzer . '" name="generator">';
}
add_filter( 'get_the_generator_xhtml', 'wpdocs_generator_as_jazzer', 10, 2 );

http://fotd.werdswords.com/get_the_generator_type/