wordpress add extra field

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//add extera field
// Add custom Slider ID field to ‘Edit Page’
// Callback function to show fields in meta box
wp_enqueue_script(‘custom-js’, get_template_directory_uri().’/js/custom-js.js’);
$prefix = ‘wp_’;
$meta_box = array(
‘id’ => ‘my-meta-box’,
‘title’ => ‘Add Search Box Field’,
‘page’ => ‘place’,
‘context’ => ‘normal’,
‘priority’ => ‘high’,
‘fields’ => array(
array(
‘name’ => ‘By Specialty’,
‘desc’ => ”,
‘id’ => $prefix . ‘specialty’,
‘type’ => ‘select’,
‘std’ => ”
),

array(
‘name’ => ‘Doctor Name’,
‘desc’ => ”,
‘id’ => $prefix . ‘doctor’,
‘type’ => ‘text’,
‘std’ => ”
),
array(
‘name’ => ‘By Procedure’,
‘desc’ => ”,
‘id’ => $prefix . ‘procedure’,
‘type’ => ‘select’,
‘std’ => ”
),
array(
‘name’ => ‘By Condition’,
‘desc’ => ”,
‘id’ => $prefix . ‘condition’,
‘type’ => ‘select’,
‘std’ => ”
),
)
);

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’]);
}

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) {

if($field[‘id’]==’wp_specialty’){

global $wp_query;
$field[‘options’]= array(”);
$args1 = array_merge( $wp_query->query_vars, array( ‘post_type’ => ‘specialty’ ) );
$sp = query_posts( $args1 );
foreach($sp as $val)
{
$field[‘options’][]=$val->post_title;
}

}
if($field[‘id’]==’wp_procedure’){
global $wp_query;
$field[‘options’]= array(”);
$args1 = array_merge( $wp_query->query_vars, array( ‘post_type’ => ‘procedure’ ) );
$sp = query_posts( $args1 );
foreach($sp as $val)
{
$field[‘options’][]=$val->post_title;
}
//$field[‘options’]= array(”,’acupuncture’,’orthodontics’,’kidney transplant’);
}
if($field[‘id’]==’wp_condition’){
global $wp_query;
$field[‘options’]= array(”);
$args1 = array_merge( $wp_query->query_vars, array( ‘post_type’ => ‘conditions’ ) );
$sp = query_posts( $args1 );
foreach($sp as $val)
{
$field[‘options’][]=$val->post_title;
}
// $field[‘options’]= array(”,’insomnia’,’meningitis’);
}

// get current post meta data
$meta = get_post_meta($post->ID, $field[‘id’], true);
echo ‘<tr>’,
‘<th style=”width:25%”><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:50%” />’, ‘<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><td>’,
‘</td></tr>’;
}
echo ‘</table>’;
}

add_action(‘save_post’, ‘mytheme_save_data’);
// Save datafrom 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 (‘place’ == $_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);
}
}
}