WP : page templates in sub folders

wp-subfolder-templates.php

<?php

/* Pages templates in subfolders */

/* 

This will add ./pages/my-custom-folder/*.php templates
if no "Template Name: My name" is specified, name will be : "Subfolder > Filename"

*/

add_filter('theme_page_templates', function($post_templates) {
  $directories = glob(get_template_directory() . '/pages/*' , GLOB_ONLYDIR);
  
  foreach ($directories as $dir) {
    $templates = glob($dir.'/*.php');

    foreach ($templates as $template) {
      if (preg_match('|Template'.' '.'Name: (.*)$|mi', file_get_contents($template), $name)) {
        $name = $name[1];
      } else {
        $name = ucfirst(basename($dir)) .' > '. ucfirst(pathinfo($template)['filename']);
      }
      $post_templates['/pages/'.basename($dir).'/'.basename($template)] = $name;
    }
  }

  return $post_templates;
});

note : in the preg_match method, the Template'.' '.'Name prevents this piece of code of being detected itself as a template with the name : (.*)$|mi', file_get_contents($template), $name)) {