Ignore single quotes when alphabetizing

You can add a filter function that returns the correct alphabet letter. I’ve put some code below that should work for you if you copy it into your theme’s functions.php file – you’ll need version 3.0.0 of A-Z Listing, which was released an hour ago. I’ve also made a note to add this feature in a future version.

add_filter( 'a_z_listing_item_index_letter', 'ignore_quotes_in_a_z_listing', 10, 3 );

function ignore_quotes_in_a_z_listing( $indices, $item, $type ) {
    if ( 'term' === $type ) {
        $title = $item->name;
    } else {
        $title = get_the_title( $item );
    }

    if ( false === strpos( $title, '"' ) && false === strpos( $title, '\'' ) ) {
        return $indices;
    }

    return [ mb_substr( $title, 1, 1 ) ];
}

Thank you very much for that code. It’s taken me a while to get around to implementing it, but I’ve now got it working. I had to make a few changes:

add_filter( 'a_z_listing_item_index_letter', 'ignore_quotes_in_a_z_listing', 10, 3 );

function ignore_quotes_in_a_z_listing( $indices, $item, $type ) {
    if ( 'terms' === $type ) {
        $title = $item->name;
    } else {
        $title = get_the_title( $item );
    }
    if ( ( 0 === strpos( $title, '"' ) ) || ( 0 === strpos( $title, '\'' ) ) ) {
	return [ mb_substr( $title, 1, 1 ) ];
    } else {
	return $indices;
    }
}

Notes

[1] In line 2 of the function it must be ‘terms‘, not ‘term’; it took me a while to spot that!

[2] I had to test the first character of $title (so 0, not false), because your code would have caused Land’s End to be alphabetized under ‘A’.