Improve return type for get_post_types (#148)

The result of `get_post_type` is an associative array keyed with the post type
slugs.

Author: lipemat

functionMap.php

@@ -77,7 +77,7 @@
     'is_wp_error' => ['($thing is \WP_Error ? true : false)', '@phpstan-assert-if-true' => '\WP_Error $thing'],
     'current_time' => ["(\$type is 'timestamp'|'U' ? int : string)"],
     'mysql2date' => ["(\$format is 'G'|'U' ? int|false : string|false)"],
-    'get_post_types' => ["(\$output is 'names' ? array<int, string> : array<int, \WP_Post_Type>)"],
+    'get_post_types' => ["(\$output is 'names' ? array<string, string> : array<string, \WP_Post_Type>)"],
     'get_taxonomies' => ["(\$output is 'names' ? array<int, string> : array<int, \WP_Taxonomy>)"],
     'get_object_taxonomies' => ["(\$output is 'names' ? array<int, string> : array<string, \WP_Taxonomy>)"],
     'get_attachment_taxonomies' => ["(\$output is 'names' ? array<int, string> : array<string, \WP_Taxonomy>)"],

tests/data/get_post_types.php

@@ -8,14 +8,14 @@
 use function PHPStan\Testing\assertType;
 
 // Default output
-assertType('array<int, string>', get_post_types([]));
-assertType('array<int, string>', get_post_types([], 'names'));
+assertType('array<string, string>', get_post_types([]));
+assertType('array<string, string>', get_post_types([], 'names'));
 
 // Objects output
-assertType('array<int, WP_Post_Type>', get_post_types([], 'objects'));
+assertType('array<string, WP_Post_Type>', get_post_types([], 'objects'));
 
 // Unknown string
-assertType('array<int, string|WP_Post_Type>', get_post_types([], (string)$_GET['unknown_string']));
+assertType('array<string, string|WP_Post_Type>', get_post_types([], (string)$_GET['unknown_string']));
 
 // Unexpected output
-assertType('array<int, WP_Post_Type>', get_post_types([], 'Hello'));
+assertType('array<string, WP_Post_Type>', get_post_types([], 'Hello'));

wordpress-stubs.php

@@ -125930,7 +125930,7 @@ function get_post_type_object($post_type)
      *                               element from the array needs to match; 'and' means all elements
      *                               must match; 'not' means no elements may match. Default 'and'.
      * @return string[]|WP_Post_Type[] An array of post type names or objects.
-     * @phpstan-return ($output is 'names' ? array<int, string> : array<int, \WP_Post_Type>)
+     * @phpstan-return ($output is 'names' ? array<string, string> : array<string, \WP_Post_Type>)
      */
     function get_post_types($args = array(), $output = 'names', $operator = 'and')
     {