Save meta box options data

<?php

$prefix = 'dbt_';
$meta_box = array(

'id' => 'my-meta-box',

'title' => 'Custom meta box',

'page' => 'post',

'context' => 'normal',

'priority' => 'high',

'fields' => array(

array(

'name' => 'Text box',

'desc' => 'Enter something here',

'id' => $prefix . 'text',

'type' => 'text',

'std' => 'Default value 1'

),

array(

'name' => 'Textarea',

'desc' => 'Enter big text here',

'id' => $prefix . 'textarea',

'type' => 'textarea',

'std' => 'Default value 2'

),

array(

'name' => 'Select box',

'id' => $prefix . 'select',

'type' => 'select',

'options' => array('Option 1', 'Option 2', 'Option 3')

),

array(

'name' => 'Radio',

'id' => $prefix . 'radio',

'type' => 'radio',

'options' => array(

array('name' => 'Name 1', 'value' => 'Value 1'),

array('name' => 'Name 2', 'value' => 'Value 2')

)

),

array(

'name' => 'Checkbox',

'id' => $prefix . 'checkbox',

'type' => 'checkbox'

)

)

);
add_action('admin_menu', 'mytheme_add_box');
// Add meta box

function mytheme_add_box() {

global $meta_box;



add_meta_box($meta_box['id'], $meta_box['title'], 'mytheme_show_box', $meta_box['page'], $meta_box['context'], $meta_box['priority']);

}
// Callback function to show fields in meta box

function mytheme_show_box() {

global $meta_box, $post;



// Use nonce for verification

echo '<input type="hidden" name="mytheme_meta_box_nonce" value="', wp_create_nonce(basename(__FILE__)), '" />';



echo '<table class="form-table">';
foreach ($meta_box['fields'] as $field) {

// get current post meta data

$meta = get_post_meta($post->ID, $field['id'], true);



echo '<tr>',

'<th style="width:20%"><label for="', $field['id'], '">', $field['name'], '</label></th>',

'<td>';

switch ($field['type']) {

case 'text':

echo '<input type="text" name="', $field['id'], '" id="', $field['id'], '" value="', $meta ? $meta : $field['std'], '" size="30" style="width:97%" />',

'<br />', $field['desc'];

break;

case 'textarea':

echo '<textarea name="', $field['id'], '" id="', $field['id'], '" cols="60" rows="4" style="width:97%">', $meta ? $meta : $field['std'], '</textarea>',

'<br />', $field['desc'];

break;

case 'select':

echo '<select name="', $field['id'], '" id="', $field['id'], '">';

foreach ($field['options'] as $option) {

echo '<option', $meta == $option ? ' selected="selected"' : '', '>', $option, '</option>';

}

echo '</select>';

break;

case 'radio':

foreach ($field['options'] as $option) {

echo '<input type="radio" name="', $field['id'], '" value="', $option['value'], '"', $meta == $option['value'] ? ' checked="checked"' : '', ' />', $option['name'];

}

break;

case 'checkbox':

echo '<input type="checkbox" name="', $field['id'], '" id="', $field['id'], '"', $meta ? ' checked="checked"' : '', ' />';

break;

}

echo '<td>',

'</tr>';

}



echo '</table>';

}
add_action('save_post', 'mytheme_save_data');
// Save data from meta box

function mytheme_save_data($post_id) {

global $meta_box;



// verify nonce

if (!wp_verify_nonce($_POST['mytheme_meta_box_nonce'], basename(__FILE__))) {

return $post_id;

}
// check autosave

if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {

return $post_id;

}
// check permissions

if ('page' == $_POST['post_type']) {

if (!current_user_can('edit_page', $post_id)) {

return $post_id;

}

} elseif (!current_user_can('edit_post', $post_id)) {

return $post_id;

}



foreach ($meta_box['fields'] as $field) {

$old = get_post_meta($post_id, $field['id'], true);

$new = $_POST[$field['id']];



if ($new && $new != $old) {

update_post_meta($post_id, $field['id'], $new);

} elseif ('' == $new && $old) {

delete_post_meta($post_id, $field['id'], $old);

}

}

}
?>