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apply_filters( "theme_{$post_type}_templates", string[] $post_templates, WP_Theme $this, WP_Post|null $post, string $post_type )

Filters list of page templates for a theme.

The dynamic portion of the hook name, $post_type, refers to the post type.

$post_templates: (string[]) Array of template header names keyed by the template file name.
$this: (WP_Theme) The theme object.
$post: (WP_Post|null) The post being edited, provided for context, or null.
$post_type: (string) Post type to get the templates for.

Used By	Description
wp-includes/class-wp-theme.php: WP_Theme::get_page_templates()	Returns the theme’s post templates for a given post type.

Version	Description
4.7.0	Added the `$post_type` parameter.
4.4.0	Converted to allow complete control over the `$page_templates` array.
3.9.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/theme_post_type_templates