Add json_encode_object for encoding objects (mainly SimpleXML obj.)

src/MD_STD.php

@@ -215,6 +215,27 @@ final class MD_STD {
 
     }
 
+    /**
+     * Type-safe wrapper around json_encode for objects.
+     *
+     * @see https://www.php.net/manual/en/function.json-encode.php
+     *
+     * @param object  $value   The value being encoded. Can be any type except a resource.
+     * @param integer $options Bitmask consisting of JSON_FORCE_OBJECT, JSON_HEX_QUOT ...
+     * @param integer $depth   Depth of coding.
+     *
+     * @return string
+     */
+    public static function json_encode_object(object $value, int $options = 0, int $depth = 512):string {
+
+        $output = \json_encode($value, $options, $depth);
+        if ($output === false) {
+            throw new Exception("JSON output could not be generated");
+        }
+        return $output;
+
+    }
+
     /**
      * Type-safe wrapper around strtotime().
      *