Custom field array issue

Hi

I’m having difficualties defining the URL with a custom field within an array

$apps = array(
        'iPhone OS' => array(
            'name' => 'iPhone app',
            'url' => get_post_meta($post->ID, 'iphone_app_link', true),
            'version_support_rex' => '/.*/'
        ),
        'Android' => array(
            'name' => 'Android app',
            'url' => get_post_meta($post->ID, 'android_app_link', true),
            'version_support_rex' => '/^[23456789].*$/'
        ),

What am I doing wrong?

Thanks