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I'm thinking this may be more of a problem with my PHP rather than my use of the settings API, but I can't seem to get Wordpress to save an array of data for a multi-select box.

The multi-select box corresponds to a custom meta field, and the select options are the custom post types that will display that meta field.

Here is the display code:

case 'select2':  
        echo "<select id='$id' style='width:15em;height:10em;' class='select$field_class' name='" . $buddha_option_name . "[$id]' multiple>";  
        foreach($choices as $item) {  

            $item = explode("|",$item);  
            $item[0] = esc_html($item[0], 'buddha_textdomain');  

            $selected = ($options[$id]==$item[1]) ? 'selected="selected"' : '';  
            echo "<option value='$item[1]' $selected>$item[0]</option>";  
        echo "</select>";  
        echo ($desc != '') ? "<br /><span class='description'>$desc</span>" : ""; 

$choices is defined here as 'choices':

$options[] = array(  
    "section" => "custom_meta",  
    "id"      => BUDDHA_SHORTNAME . "_meta_email",  
    "title"   => __( 'Email Meta Box', 'buddha_textdomain' ),  
    "desc"    => __( 'Select post types to have custom email meta box.', 'buddha_textdomain' ),  
    "type"    => "select2",  
    "std"    => print_r($buddha_option_name[$id]),  
    "choices" => array( __('Posts','buddha_textdomain') . "|post", __('Pages','buddha_textdomain') . "|page", __('Faculty/Staff','buddha_textdomain') . "|staff", __('FAQ','buddha_textdomain') . "|faq", __('Documents','buddha_textdomain') . "|docs", __('Courses','buddha_textdomain') . "|courses" )  

And the validation code:

case 'select2': 
                // process $select_values 
                    $select_values = array(); 
                    foreach ($option['choices'] as $k => $v) { 
                        // explode the connective 
                        $pieces = explode("|", $v); 

                        $select_values[] = $pieces[1]; 
                // check to see if selected value is in our approved array of values! 
                $valid_input[$option['id']] = (in_array( $input[$option['id']], $select_values) ? $input[$option['id']] : '' ); 

Currently, if I select more than one value from the multi-select field, WP will only save one value (usually the first alphabetical value). I need it to save more than one value in the array.

I thought adding [] to the end of [$id] might help, but no.

share|improve this question
What's $id? And why are using print_r in an assign context? –  TheDeadMedic Jun 27 '13 at 6:06
$id is the same as "id" => BUDDHA_SHORTNAME . "_meta_email", it's defined in another function. And I don't really know why I did print_r there, doesn't make much sense does it? –  Spartacus Jun 27 '13 at 18:47
Did you make it work? Addin [] at the end of name attribute helped me. Double check the name attribute. Do you check the mySQL db what settings are stored? –  Radek Aug 22 '13 at 1:10
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