get_sites() generates a PHP warning

[henry.wright]

The following usage of get_sites() generates a PHP warning.

$sites = get_sites(
    [
        'search'         => 'foo',
        'search_columns' => 'domain'
    ]
);

Warning: array_intersect(): Argument #1 is not an array in wp-includes/class-wp-site-query.php on line 563

[henry.wright]

I just noticed search_columns _must_ be an array.

Please close