增加一个函数统一处理markdown的问题

web/admin/md_check.php

@@ -0,0 +1,17 @@
+<?php
+function decodeMarkdownEntities($markdown) {
+    // Decode HTML entities in code blocks
+    $markdown = preg_replace_callback('/(```.*?```|`[^`]*`)/s', function ($matches) {
+        return htmlentities($matches[0], ENT_QUOTES, 'UTF-8');
+    }, $markdown);
+
+    // Decode HTML entities in inline math and display math
+    $markdown = preg_replace_callback('/(\$\$.*?\$\$|\$[^$]*\$)/s', function ($matches) {
+        return htmlentities($matches[0], ENT_QUOTES, 'UTF-8');
+    }, $markdown);
+    // 特殊转义
+    $markdown = str_replace("<p>", "", $markdown);
+    $markdown = str_replace("</p>", "\n\n", $markdown);
+    $markdown = str_replace("<br />", "\n\n", $markdown);
+    return $markdown;
+}