Solve the problem that WordPress 4.9 page template function cannot be used normally

Today, I encountered a problem about the page template can not be used. I found a lot of relevant information, but it can not be solved. Finally, even if the problem in the WordPress theme is fixed, the link address of the relevant page still needs to be changed to solve it. The relevant records and extracts are as follows:

An important update of WordPress 4.9 is that when editing theme and plugin files in the WP background, all files can be displayed hierarchically. For the sake of performance, the “transient” caching mechanism is used. However, it does not provide any function to clear the cache manually. As a result, some users found that the function of “page properties template” could not be used normally after upgrading to WordPress 4.9, and the template file of the theme was not displayed!

To solve this problem, we can add the following code to the functions.php That’s it:

 * Plugin name: WP Trac #42573: Fix for theme template file caching.
 * Description: Flush the theme file cache each time the admin screens are loaded which uses the file list.
 * Plugin URI:
 * Author: Weston Ruter, XWP.
 * Author URI:
function wp_42573_fix_template_caching( WP_Screen $current_screen ) {
	// Only flush the file cache with each request to post list table, edit post screen, or theme editor.
	if ( ! in_array( $current_screen->base, array( 'post', 'edit', 'theme-editor' ), true ) ) {
	$theme = wp_get_theme();
	if ( ! $theme ) {
	$cache_hash = md5( $theme->get_theme_root() . '/' . $theme->get_stylesheet() );
	$label = sanitize_key( 'files_' . $cache_hash . '-' . $theme->get( 'Version' ) );
	$transient_key = substr( $label, 0, 29 ) . md5( $label );
	delete_transient( $transient_key );
add_action( 'current_screen', 'wp_42573_fix_template_caching' );

If you are not a developer, it is recommended that you use the following plugins and install them directly.

link: Password: RTOD


The above excerpts are as follows:


This problem only appears in version 4.9, and has been fixed since 4.9.1. However, in my client’s website, although the version is upgraded from 4.9 to 4.9.4, and the plugin is also installed, the page template cannot be used in the original links of the existing pages. Processing method is: create a new page for a page address (namely link alias). In this way, the problem is solved. Only if the record, if you also found this problem, you can try the above method.

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