Option to add callback in the settings fields

Author: chiqui3d

src/class.settings-api.php

@@ -141,7 +141,7 @@ function admin_init() {
                     'type' => $type,
                 );
 
-                add_settings_field( $section . '[' . $option['name'] . ']', $option['label'], array( $this, 'callback_' . $type ), $section, $section, $args );
+                add_settings_field( $section . '[' . $option['name'] . ']', $option['label'], (isset($option['callback']) ? $option['callback'] : array($this, 'callback_' . $type )), $section, $section, $args );
             }
         }