Ticket #25435: 25435.3.diff

src/wp-includes/shortcodes.php

@@ -228 +228 @@
 }
 
 /**
+ * Execute a single shortcode with given attributes.
+ *
+ * @param string $tag Name of a registered Shortcode.
+ * @param array $atts Attributes to pass to the shortcode hook.
+ * @param string $content Content inside the tag. Null for self-closing.
+ * @return string|WP_Error Shortcode content, or WP_Error instance if invalid.
+ */
+function do_single_shortcode( $tag, $atts = array(), $content = null ) {
+        global $shortcode_tags;
+        if ( empty( $shortcode_tags[ $tag ] ) ) {
+                return new WP_Error( 'shortcode_invalid_tag', __( 'Shortcode is not registered' ), $tag );
+        }
+
+        $callback = $shortcode_tags[ $tag ];
+        if ( ! is_callable( $callback ) ) {
+                return new WP_Error( 'shortcode_invalid_callback', __( 'Shortcode does not have a valid callback registered' ), $tag );
+        }
+
+        return call_user_func( $callback, $atts, $content, $tag );
+}
+
+/**
  * Retrieve the shortcode regular expression for searching.
  *
  * The regular expression combines the shortcode tags in the regular expression