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I am creating a widget, it needs to store about 10 IDs. Right now I'm using following field method to store each of the ID in a separate field. It stores data of each field in a separately in the wordpress. Is it possible to store the data of all fields in just one row in wordpress for examlpe using an array?

<input 
    class="widefat" 
    id="<?php echo $this->get_field_id('item1_id'); ?>" 
    name="<?php echo $this->get_field_name('item1_id'); ?>" 
    value="<?php echo $instance['item1_id']; ?>" 
    />

<input 
    class="widefat" 
    id="<?php echo $this->get_field_id('item2_id'); ?>" 
    name="<?php echo $this->get_field_name('item2_id'); ?>" 
    value="<?php echo $instance['item2_id']; ?>" 
    />
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1  
$instance is an array and contains all values. And what do you mean by 'to store the data of all fields in just one row'? Did you mean one database row? –  Ralf912 Apr 4 '13 at 20:43
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1 Answer

up vote 3 down vote accepted

You have to collect multiple fields under the same name like this …

name="collect[1]"
name="collect[2]"

… and adjust your widget logic to this.

Here is a very simple demo widget:

<?php  # -*- coding: utf-8 -*-
/* Plugin Name: Store Options as array */

add_action( 'widgets_init', array ( 'T5_Array_Options_Widget', 'register' ) );

class T5_Array_Options_Widget extends WP_Widget
{
    /**
     * Constructor.
     */
    public function __construct()
    {
        parent::__construct( strtolower( __CLASS__ ), 'Array Demo' );
    }

    /**
     * Echo the settings update form
     *
     * @param array $instance Current settings
     */
    public function form( $instance )
    {
        $title = isset ( $instance['title'] ) ? $instance['title'] : '';
        $title = esc_attr( $title );

        printf(
            '<p><label for="%1$s">%2$s</label><br />
            <input type="text" name="%3$s" id="%1$s" value="%4$s" class="widefat"></p>',
            $this->get_field_id( 'title' ),
            'Title',
            $this->get_field_name( 'title' ),
            $title
        );

        $fields = isset ( $instance['fields'] ) ? $instance['fields'] : array();
        $field_num = count( $fields );
        $fields[ $field_num + 1 ] = '';
        $fields_html = array();
        $fields_counter = 0;

        foreach ( $fields as $name => $value )
        {
            $fields_html[] = sprintf(
                '<input type="text" name="%1$s[%2$s]" value="%3$s" class="widefat">',
                $this->get_field_name( 'fields' ),
                $fields_counter,
                esc_attr( $value )
            );
            $fields_counter += 1;
        }

        print 'Fields<br />' . join( '<br />', $fields_html );
    }

    /**
     * Renders the output.
     *
     * @see WP_Widget::widget()
     */
    public function widget( $args, $instance )
    {
        print $args['before_widget']
        . $args['before_title']
        . apply_filters( 'widget_title', $instance['title'] )
        . $args['after_title']
        . join( '<br />', $instance['fields'] )
        . $args['after_widget'];
    }

    /**
     * Prepares the content. Not.
     *
     * @param  array $new_instance New content
     * @param  array $old_instance Old content
     * @return array New content
     */
    public function update( $new_instance, $old_instance )
    {
        $instance          = $old_instance;
        $instance['title'] = esc_html( $new_instance['title'] );

        $instance['fields'] = array();

        if ( isset ( $new_instance['fields'] ) )
        {
            foreach ( $new_instance['fields'] as $value )
            {
                if ( '' !== trim( $value ) )
                    $instance['fields'][] = $value;
            }
        }

        return $instance;
    }

    /**
     * Tell WP we want to use this widget.
     *
     * @wp-hook widgets_init
     * @return void
     */
    public static function register()
    {
        register_widget( __CLASS__ );
    }
}

Backend

enter image description here

Frontend

enter image description here

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