Add select menu to filter by custom field in admin

Adding this snippet to the functions.php of your wordpress theme will add a select menu with a list of all custom fields, just select the field you want to filter by and click the filter button.

 

 

add_filter( 'parse_query', 'ba_admin_posts_filter' );
add_action( 'restrict_manage_posts', 'ba_admin_posts_filter_restrict_manage_posts' );
function ba_admin_posts_filter( $query )
{
global $pagenow;
if ( is_admin() && $pagenow=='edit.php' && isset($_GET['ADMIN_FILTER_FIELD_NAME']) && $_GET['ADMIN_FILTER_FIELD_NAME'] != '') {
$query->query_vars['meta_key'] = $_GET['ADMIN_FILTER_FIELD_NAME'];
if (isset($_GET['ADMIN_FILTER_FIELD_VALUE']) && $_GET['ADMIN_FILTER_FIELD_VALUE'] != '')
$query->query_vars['meta_value'] = $_GET['ADMIN_FILTER_FIELD_VALUE'];
}
}
function ba_admin_posts_filter_restrict_manage_posts()
{
global $wpdb;
$sql = 'SELECT DISTINCT meta_key FROM '.$wpdb->postmeta.' ORDER BY 1';
$fields = $wpdb->get_results($sql, ARRAY_N);
?>
<select name="ADMIN_FILTER_FIELD_NAME">
<option value=""><?php _e('Filter By Custom Fields', 'baapf'); ?></option>
<?php
$current = isset($_GET['ADMIN_FILTER_FIELD_NAME'])? $_GET['ADMIN_FILTER_FIELD_NAME']:'';
$current_v = isset($_GET['ADMIN_FILTER_FIELD_VALUE'])? $_GET['ADMIN_FILTER_FIELD_VALUE']:'';
foreach ($fields as $field) {
if (substr($field[0],0,1) != "_"){
printf
(
'<option value="%s"%s>%s</option>',
$field[0],
$field[0] == $current? ' selected="selected"':'',
$field[0]
);
}
}
?>
</select> <?php _e('Value:', 'baapf'); ?><input type="TEXT" name="ADMIN_FILTER_FIELD_VALUE" value="<?php echo $current_v; ?>" />
<?php
}

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