Get custom post types and page templates in php

get_custom_post_types_and_page_templates

function get_custom_post_types_and_page_templates() {
	global $wp_post_types;
	// Public custom post types.
	$args = [
		'public'   => true,
		'_builtin' => false,
	];

	// Get the lists and add a suffix which denotes the type, Page or Post.
	$post_types = preg_filter( '/$/', ' (Post)', get_post_types( $args ) );;
	$templates = preg_filter( '/$/', ' (Page)', wp_get_theme()->get_page_templates() );

	// Combine the arrays and sort alphabetically (maintain index association).
	$output = array_merge( $post_types, $templates );
	asort( $output );

	echo json_encode( $wp_post_types );
	die();
}