从cmb2自定义metabox文件(CMB2)获取图像替代文本

<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

if ( ! function_exists( 'cmb2_bootstrap' ) ) {
    require_once 'cmb2/init.php';
}

function cmb2_custom_metabox() {
    $prefix = '_cmb2_';

    $cmb = new_cmb2_box( array(
        'id'           => $prefix . 'metabox',
        'title'        => __( 'Image Metabox', 'cmb2' ),
        'object_types' => array( 'post', 'page' ), // 可以根据需要更改为其他自定义帖子类型
    ) );

    $cmb->add_field( array(
        'name' => __( 'Image', 'cmb2' ),
        'id'   => $prefix . 'image',
        'type' => 'file',
    ) );

    $cmb->add_field( array(
        'name' => __( 'Image Alt Text', 'cmb2' ),
        'id'   => $prefix . 'image_alt',
        'type' => 'text',
    ) );
}

add_action( 'cmb2_admin_init', 'cmb2_custom_metabox' );

<?php
$image_alt = get_post_meta( get_the_ID(), '_cmb2_image_alt', true );
echo $image_alt;
?>