下面是从wp_get_update_data() 功能：

Array
(
    [counts] => Array
        (
            [plugins] => 3
            [themes] => 2
            [wordpress] => 0
            [translations] => 0
            [total] => 5
        )

    [title] => 3 Plugin Updates, 2 Theme Updates
)

// Number of available plugin updates:
$update_data = wp_get_update_data();
echo $update_data[\'counts\'][\'plugins\'];

Update:

有可用的更新3 插件（共个）22

我们还可以使用get_plugins() 功能：

if ( ! function_exists( \'get_plugins\' ) )
{
    require_once ABSPATH . \'wp-admin/includes/plugin.php\';
}

$data = array( 
    \'updates\'   =>  $update_data[\'counts\'][\'plugins\'],
    \'total\'     =>  count( get_plugins() ),
);

printf( 
    "There are available updates for <strong>%d</strong> plugins  
     out of <strong>%d</strong>",
    $data[\'updates\'],
    $data[\'total\']
);