Notice: Array to string conversion

[arieputranto]

PHP Notice

Array to string conversion on \wp-includes\template.php on line 67

[duck_]

Could you give the query that's producing this? Quick testing with a multi-post type query and I can't get the archive template to be loaded.

Also, it's likely this can be triggered since 3.1.

[arieputranto]

It happened when the post_format archive is being loaded e.g.: ​http://localhost/type/media

I fixed mine by adding a line on line: 65 of wp-includes/template.php:

$post_type = $post_type[0];

$wp_query->query['post_format'] and $wp_query->query_vars['post_format']

are indeed an array.

[SergeyBiryukov]

Confirmed. $templates in get_archive_template() ends up being this:

Array
(
    [0] => archive-Array.php
    [1] => archive.php
)

[duck_]

Caused by the post_type query variable being set to an array by _post_format_request(), see [17249] for #16149.

Similar #18475.

[nacin]

In [21861]:

Expect a possible array of post types in get_archive_template(). props SergeyBiryukov. fixes #20867.

[scribu]

Follow-up: #22956