diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-includes/IXR/class-IXR-base64.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/IXR/class-IXR-base64.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * IXR_Base64
+ *
+ * @package IXR
+ * @since 1.5.0
+ */
+class IXR_Base64
+{
+    var $data;
+
+	/**
+	 * PHP5 constructor.
+	 */
+    function __construct( $data )
+    {
+        $this->data = $data;
+    }
+
+	/**
+	 * PHP4 constructor.
+	 */
+	public function IXR_Base64( $data ) {
+		self::__construct( $data );
+	}
+
+    function getXml()
+    {
+        return '<base64>'.base64_encode($this->data).'</base64>';
+    }
+}