PHP Warning: Invalid argument supplied for foreach()

Hi @jimingkui,

Thanks for the report. I’ll look into it as soon as possible.

Which WordPress version are you using at the moment?

WordPress 4.7.5,

Will upgrade wordpress to the latest fix the problem?

Thanks for reporting back, @jimingkui.

Will upgrade wordpress to the latest fix the problem?

No, I needed to know which version of WordPress you have there to see what line 298 in /wp-includes/rest-api/endpoints/class-wp-rest-controller.php does on WordPress version 4.7.5.

In case you’re curious, it’s this:

/**
 * Retrieves the item's schema for display / public consumption purposes.
 *
 * @since 4.7.0
 * @access public
 *
 * @return array Public item schema data.
 */
public function get_public_item_schema() {

    $schema = $this->get_item_schema();

    foreach ( $schema['properties'] as &$property ) { // <-- Here!
        unset( $property['arg_options'] );
    }

    return $schema;
}

You don’t really need to upgrade to the latest version of WordPress (but you really should consider upgrading, your site is currently open to many known security holes right now!)

Anyways, please try this:

1. Go to Plugins > Editor and select WordPress Popular Posts from the dropdown.
2. Click on includes, then on class-wordpress-popular-posts-rest-controller.php to edit it.
3. Find (around line 37):

   'schema' => array( $this, 'get_public_item_schema' ),

   and change it to:

   //'schema' => array( $this, 'get_public_item_schema' ),

4. Next, click on Update file to save changes.

Please report back your results.