function customfield_1_shortcode( $atts ) {

            if ( get_post_meta( get_the_ID(), \'customfield1\', true ) ) {
        $customfield = get_post_meta( get_the_ID(), \'customfield1\', true );

    return "html stuff";
}
add_shortcode( \'customfield_1\', \'customfield_1_shortcode\' );

function customfield_2_shortcode( $atts ) {

            if ( get_post_meta( get_the_ID(), \'customfield2\', true ) ) {
        $customfield = get_post_meta( get_the_ID(), \'customfield2\', true );

    return "html stuff";
}
add_shortcode( \'customfield_2\', \'customfield_2_shortcode\' );
?>

我可以使用[customfield\\u 1]输出customfield1内容，使用[customfield\\u 2]输出customfield2。将这两个或多个功能（customfield\\u 3、customfield\\u 4等）结合起来以达到类似效果的最佳方法是什么？

function customfields_shortcode( $atts ) {
  if (!empty($atts[\'field\']) && get_post_meta( get_the_ID(), $atts[\'field\'], true ) ) {
    $customfield = get_post_meta( get_the_ID(), $atts[\'field\'], true );
    return "custom field >> $customfield << custom field";
  }
}
add_shortcode( \'mycustomfields\', \'customfields_shortcode\' );

echo do_shortcode(\'[mycustomfields field="customfield_1"]\');