Check the value passed to `get_post_type_object()`. If it's an array, use the first item. `get_query_var( 'post_type' )` can be an array if the query has been altered via filters/actions. There are several places in core that pass the query var. Adds unit tests.

In `template-loader.php`, move `is_post_type_archive()` and `is_tax()` directly below `is_home()`.

See #18614, [25291].


Built from https://develop.svn.wordpress.org/trunk@25292


git-svn-id: http://core.svn.wordpress.org/trunk@25256 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -1058,6 +1058,9 @@ function get_post_type( $post = null ) {
 function get_post_type_object( $post_type ) {
 	global $wp_post_types;
 
+	if ( is_array( $post_type ) )
+		$post_type = reset( $post_type );
+
 	if ( empty($wp_post_types[$post_type]) )
 		return null;
 

wp-includes/template-loader.php

@@ -26,10 +26,10 @@ if ( defined('WP_USE_THEMES') && WP_USE_THEMES ) :
 	$template = false;
 	if     ( is_404()            && $template = get_404_template()            ) :
 	elseif ( is_search()         && $template = get_search_template()         ) :
-	elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) : 
-	elseif ( is_tax()            && $template = get_taxonomy_template()       ) :
 	elseif ( is_front_page()     && $template = get_front_page_template()     ) :
 	elseif ( is_home()           && $template = get_home_template()           ) :
+	elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) :
+	elseif ( is_tax()            && $template = get_taxonomy_template()       ) :
 	elseif ( is_attachment()     && $template = get_attachment_template()     ) :
 		remove_filter('the_content', 'prepend_attachment');
 	elseif ( is_single()         && $template = get_single_template()         ) :