Multiple on selectbox doesn't work

[jeffreyvr]

When setting multiple on true (by types select and chosen), nothing happends. Here is a quick fix, it might not be perfect, but it does work.

Add this under line 19 in meta-boxe.php
$multiple = isset($field['multiple']) ? $field['multiple'] : null;

Then replace the code between line 67 and 75:

// select, chosen
case 'select':
case 'chosen':
    if(isset($multiple)) : // multiple
        echo '<select name="' . esc_attr($name) . '[]" multiple id="' . esc_attr($id) . '"', $type == 'chosen' ? ' class="chosen"' : '', '>';
        foreach ($options as $option) :
        if(is_array($meta) && in_array($option['value'], $meta)) :
                echo '<option selected value="' . $option['value'] . '">' . $option['label'] . '</option>';
            else :
            echo '<option value="' . $option['value'] . '">' . $option['label'] . '</option>';  
            endif;
        endforeach;
    echo '</select>';
    else : // normal select
        echo '<select name="' . esc_attr( $name ) . '" id="' . esc_attr( $id ) . '"' , $type == 'chosen' ? ' class="chosen"' : '' , isset( $multiple ) && $multiple == true ? ' multiple="multiple"' : '' , '>
        <option value="">Select One</option>'; // Select One    
        foreach ( $options as $option )    
            echo '<option' . selected( $meta, $option['value'], false ) . ' value="' . $option['value'] . '">' . $option['label'] . '</option>';    
            echo '</select><br />' . $desc;    
    endif;
break;