WordPress Widget is not saving new instance - wordpress

Question

I have a very strange issue with the wordpress widget. I am editing an existed wordpress widget form Phomedia theme, and I am trying to add one more instance so I can use it to filter posts. In the code it is $instance['custom']. But everytime I hit save the value is dissapearing. I got really stuck with it for several, trying to figure out what is going wrong, but couldn't find it. Here is the code
class MZ_Widget_Latest_Products extends WP_Widget {
/**
* Widget Constuctor
*/
function MZ_Widget_Latest_Products() {
$widget_ops = array( 'classname' => 'widget_mz_wpsc_latest_products','description' => __( 'Phomedia Latest Products Widget', 'wpsc' ) );
$this->WP_Widget( 'wpsc_latest_products', __( 'Phomedia Latest Products', 'wpsc' ), $widget_ops );
}
/**
* Widget Output
*
* #param $args (array)
* #param $instance (array) Widget values.
*/
function widget( $args, $instance ) {
global $wpdb, $table_prefix;
extract( $args );
$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Latest Products', 'wpsc' ) : $instance['title'] );
echo $before_widget;
if ( $title )
echo $before_title . $title . $after_title;
wpsc_phomedia_latest_product( $args, $instance );
echo $after_widget;
}
/**
* Update Widget
*
* #param $new_instance (array) New widget values.
* #param $old_instance (array) Old widget values.
*
* #return (array) New values.
*/
function update( $new_instance, $old_instance ) {
$instance = $old_instance;
$instance['title'] = strip_tags( $new_instance['title'] );
$instance['number'] = (int)$new_instance['number'];
$instance['image'] = (bool)$new_instance['image'];
$instance['height'] = (int)$new_instance['height'];
$instance['width'] = (int)$new_instance['width'];
$instance['custom'] = $instance['custom'];
return $instance;
}
/**
* Widget Options Form
*
* #param $instance (array) Widget values.
*/
function form( $instance ) {
global $wpdb;
// Defaults
$instance = wp_parse_args( (array)$instance, array(
'title' => '',
'number' => 4,
'width' => 173,
'height' => 151
) );
// Values
$title = esc_attr( $instance['title'] );
$number = (int)$instance['number'];
$image = (bool)$instance['image'];
$width = (int) $instance['width'];
$height = (int) $instance['height'];
$custom = $instance['custom']; ?>
<p><label for="<?php echo $this->get_field_id('custom'); ?>">Custom: <input class="widefat" id="<?php echo $this->get_field_id('custom'); ?>" name="<?php echo $this->get_field_name('custom'); ?>" type="text" value="<?php echo attribute_escape($custom); ?>" /></label></p>
<p>
<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:', 'wpsc' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo $title; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e( 'Number of products to show:', 'wpsc' ); ?></label>
<input type="text" id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" value="<?php echo $number; ?>" size="3" />
</p>
<p>
<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'image' ); ?>" name="<?php echo $this->get_field_name( 'image' ); ?>"<?php checked($image); ?> onclick="jQuery('.wpsc_latest_image').toggle()">
<label for="<?php echo $this->get_field_id( 'image' ); ?>"><?php _e( 'Show Thumbnails', 'wpsc' ); ?></label>
</p>
<div class="wpsc_latest_image"<?php if( !checked( $image ) ) { echo ' style="display:none;"'; } ?>>
<p>
<label for="<?php echo $this->get_field_id('width'); ?>"><?php _e('Width:', 'wpsc'); ?></label>
<input type="text" id="<?php echo $this->get_field_id('width'); ?>" name="<?php echo $this->get_field_name('width'); ?>" value="<?php echo $width ; ?>" size="3" />
<label for="<?php echo $this->get_field_id('height'); ?>"><?php _e('Height:', 'wpsc'); ?></label>
<input type="text" id="<?php echo $this->get_field_id('height'); ?>" name="<?php echo $this->get_field_name('height'); ?>" value="<?php echo $height ; ?>" size="3" />
</p>
</div>
<?php
}
}
add_action( 'widgets_init', create_function( '', 'return register_widget("MZ_Widget_Latest_Products");' ) );
function wpsc_phomedia_latest_product( $args = null, $instance ) {
global $wpdb;
$args = wp_parse_args( (array)$args, array( 'number' => 3 ) );
$siteurl = get_option( 'siteurl' );
$options = get_option( 'wpsc-widget_latest_products' );
$number = isset($instance['number']) ? (int)$instance['number'] : 3;
$image = isset($instance['image']) ? (bool)$instance['image'] : FALSE;
if ( isset($instance['width'] ) )
$width = $instance['width'];
if ( isset( $instance['height'] ) )
$height = $instance['height'];
$latest_products = get_posts( array(
'post_type' => 'wpsc-product',
'numberposts' => $number,
'orderby' => 'post_date',
'post_parent' => 0,
'post_status' => 'publish',
'order' => 'ASC'
) );
$output = '';
$total = count( $latest_products );
$i = 0;
if ( count( $latest_products ) > 0 ) {
$output .= '<div class="grid no-border" ><ul>';
foreach ( $latest_products as $latest_product ) {
//print_r($latest_product);
$i++;
if ( !($i%3)) $class = 'last'; else $class = '';
$output .= '<li class="item '.$class.' ">';
// Thumbnails, if required
if ($image) {
$output .= '<a class="product-image" href="' . wpsc_product_url( $latest_product->ID, null ) . '">';
$attached_images = (array)get_posts( array(
'post_type' => 'attachment',
'numberposts' => 1,
'post_status' => null,
'post_parent' => $latest_product->ID,
'orderby' => 'menu_order',
'order' => 'ASC'
) );
$attached_image = $attached_images[0];
if ( $attached_image->ID > 0 )
$output .= '<img class="product_image" src="' . wpsc_product_image( $attached_image->ID, $width, $height ) . '" title="' . $latest_product->post_title . '" alt="' . $latest_product->post_title . '" />';
else
$output .='<img class="no-image product_image" id="product_image_'.wpsc_the_product_id().'" alt="No Image" title="'.wpsc_the_product_title().'" src="'.WPSC_URL.'/wpsc-theme/images/noimage.png" width="' . $width . '" height="' . $height . '" />';
$output .= '</a>';
}
// Link
$output .= '<h3 class="product-name">'.stripslashes( $latest_product->post_title ).'</h3>';
$output .= '<p class="product-desc">'. $latest_product->post_content.'</p>';
$output .= '<div class="action">';
$output .= '<div class="price-box left">';
//$output .= $latest_product->ID;
//$output .= wpsc_calculate_price( wpsc_the_product_id(),null,false );
$output .= wpsc_currency_display(get_post_meta( $latest_product->ID, '_wpsc_price', true ));
$output.= '</div>';
$output .= '<a class="button right" href="' . wpsc_product_url( $latest_product->ID, null ) . '"><span>'.__( 'Details', 'wpsc' ).'</span></a>';
$output .= '<div class="clear"></div></div>';
$output .= '</li>';
}
$output .= "</ul></div><div class=\"clear\"></div>";
}
echo $output;
}
UPDATE: Fixed this problem. It didn't save because of wrong class name as a parameter.
$widget_ops = array( 'classname' => 'widget_mz_wpsc_latest_products','description' => __( 'Phomedia Latest Products Widget', 'wpsc' ) );
$this->WP_Widget( 'wpsc_latest_products', __( 'Phomedia Latest Products', 'wpsc' ), $widget_ops );