This PHP function will auto initialize your Emojics wordpress plugin based on the host. Emojics WP Plugin is needed: https://wordpress.org/plugins/emojics-wp/

WP Emojics Auto Initialization

/**
 * This snippet needs to be added in the functions.php file of your theme
 * This function will auto initialize emojics based on the known hosts array defined in the function
 * Update $known_hosts array by adding the key => value pair host => api key as shown in the commented example
 */
function emojics_auto_init() {

    /**
     * Store key value pairs of known hosts as key and api key as value
     */
    $known_hosts = array(
    	// 'development.example.local' => '[YOUR_DEVELOPMENT_API_KEY]',
    	// 'production.example.com' => '[YOUR_PRODUCTION_API_KEY]',
    	// 'staging.example.com' => '[YOUR_STAGING_API_KEY]'
    );

    /**
     * Get the current host
     */
    $host = apply_filters( 'emojics_get_host', isset($_SERVER['HTTP_HOST'])?$_SERVER['HTTP_HOST']:false );

    /**
     * Do nothing if needed class/function doesn't exists or server host is not defined
     */
    if ( !class_exists('Emojics_Admin') || !function_exists('emojics_set_option') || !$host ) return;

    /**
     * Do nothing if the host is not in the known hosts array
     */
    if ( !isset($known_hosts[$host]) ) return;

    /**
     * Do nothing if the host api key is empty
     */
    if ( !$known_hosts[$host] ) return;

    /**
     * Do nothing if the host is already being initialized
     */
    if ( $host == get_option('_emojics_initialized_host', false) ) return;

    /**
     * Authenticate the host with api key
     */
    $e = new Emojics_Admin('emojics-wp', '1.5.4');
    $r = $e->authenticate_api_key($known_hosts[$host]);
    if ( $e->is_authentication_valid($r) ) {
        emojics_set_option( 'js_code', $r['js_code_snippet'] );
    }

    /**
     * Store the initialized host to avoid re-authentication
     */
    update_option( '_emojics_initialized_host', $host );
}
add_action( 'init', 'emojics_auto_init');