Function to auto-set your ACF5 Pro license key

php

function jtd_acf_auto_set_license_keys() {

  if ( !get_option('acf_pro_license') && defined('ACF_5_KEY') ) {

    $save = array(
			'key'	=> ACF_5_KEY,
			'url'	=> home_url()
		);

		$save = maybe_serialize($save);
		$save = base64_encode($save);

    update_option('acf_pro_license', $save);
  }
}
add_action('after_switch_theme', 'jtd_acf_auto_set_license_keys');
// you may want to add additional actions here.