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I have a problem: a wordpress site that i manage keep loose the widgets. When i open the widget admin panel, all the sidebar are empty.

I've debugged some code and found that the widget exists into the database field 'sidebars_widgets'. But when it comes to display them, it stops here:

wp-includes/widgets.php, line #658

if ( !isset($wp_registered_widgets[$id]) ) continue

because the wp_registered_widgets only contains the available and the non-active widgets. For example, i have a text-2 widget inside my sidebar, but the wp_registered_widgets variable only contains text-1, the available one.

So far, I'm in trouble with understanding where this variable is populated. Someone can help?

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Founded here: wp-includes/class-wp-widget.php #248

public function _register() {
    $settings = $this->get_settings();
    $empty = true;

    // When $settings is an array-like object, get an intrinsic array for use with array_keys().
    if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {
        $settings = $settings->getArrayCopy();
    }

    if ( is_array( $settings ) ) {
        foreach ( array_keys( $settings ) as $number ) {
            if ( is_numeric( $number ) ) {
                $this->_set( $number );
                $this->_register_one( $number );
                $empty = false;
            }
        }
    }

    if ( $empty ) {
        // If there are none, we register the widget's existence with a generic template.
        $this->_set( 1 );
        $this->_register_one();
    }
}

The get_settings function retrieve the options for the widget saved in the wp_options table. I've in someway lost these informations into the database.

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