EC CUBEで困ってしまったところをまとめてみた。
Fatal error: Uncaught Error: Call to undefined function MarkupMarkdown\Core\wp_is_rest_endpoint() in /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php:204 Stack trace: #0 /home/web13c/bistro.site/public_html/wp-includes/class-wp-hook.php(324): MarkupMarkdown\Core\Support->post_markdown2html('\xE5\x80\x8B\xE4\xBA\xBA\xE7\x9A\x84\xE3\x81\xABEC ...') #1 /home/web13c/bistro.site/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('\xE5\x80\x8B\xE4\xBA\xBA\xE7\x9A\x84\xE3\x81\xABEC ...', Array) #2 /home/web13c/bistro.site/public_html/wp-content/themes/luxeritas/inc/filters.php(292): apply_filters('the_content', '\xE5\x80\x8B\xE4\xBA\xBA\xE7\x9A\x84\xE3\x81\xABEC ...') #3 /home/web13c/bistro.site/public_html/wp-includes/class-wp-hook.php(324): {closure}('\xE5\x80\x8B\xE4\xBA\xBA\xE7\x9A\x84\xE3\x81\xABEC ...') #4 /home/web13c/bistro.site/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('', Array) #5 /home/web13c/bistro.site/public_html/wp-content/t in /home/web13c/bistro.site/public_html/wp-content/plugins/markup-markdown/MarkupMarkdown/Core/Support.php on line 204