Gets the specific template filename for a given post.

Parameters

$postint|WP_Postoptional

Post ID or WP_Post object. Default is global $post.

Default:null

Return

More Information

The filename of a Page’s assigned custom template is stored as the value of a Custom Field with a key named '_wp_page_template' (in the wp_postmeta database table). If the template is stored in a Theme’s subdirectory (or a Parent Theme’s subdirectory of a Child Theme), the value of the wp_postmeta is both the folder and file names, e.g.

my-templates/my-custom-template.php

The function get_page_template_slug() returns an empty string when the value of '_wp_page_template' is either empty or 'default'.

Custom fields starting with an underscore do not display in the Edit screen’s Custom Fields module. To retrieve a Page’s custom template metadata, you can also use:

get_post_meta( $post->ID, '_wp_page_template', true )

Source

function get_page_template_slug( $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$template = get_post_meta( $post->ID, '_wp_page_template', true );

	if ( ! $template || 'default' === $template ) {
		return '';
	}

	return $template;
}

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