Missing argument 2 for a custom function

Question

So I am trying to replace the original post_title with a custom field right of the same post after saving the changes. However, I am getting the following error on the post page:

Warning: Missing argument 2 for wpse33385_filter_title() in $PATH/public_html/wp-content/themes/$THEME/functions.php on line 113

// replaces the original post_title with the value of pac-short-title

add_filter( 'the_title', 'wpse33385_filter_title', 10, 2);

function wpse33385_filter_title( $title, $post_id )
{
    if( $new_title = types_get_field_meta_value( 'pac-short-title', $post_id ) )
    {
        return $new_title;
    }
    return $title;
}

I am confused because I have defined a number of arguments in the add_filter?

@Tristan What do yo mean? The function works, but it displays a warning on front end. — ignite-me

Tristan Tristan · Accepted Answer · 2016-06-12T23:43:18

This warning may be caused by the post id not being set in some instances of the usage of this filter in some versions of WordPress.

The solution is to set a default value for the post id.

function wpse33385_filter_title( $title, $post_id = null )

Missing argument 2 for a custom function

1 Answers