在wp-admin/edit.php中找到如下程式碼：
<?php
if ( current_user_can( $post_type_object->cap->create_posts ) ) {
echo ' <a href="' . esc_url( admin_url( $post_new_file ) ) . '" class="page-title-action">' . esc_html( $post_type_object->labels->add_new ) . '</a>';
}
在上面程式碼的下一行加入如下程式碼：
if ($post_type == 'aaa') {
echo ' <a href="'.esc_url( admin_url('admin-ajax.php?action=export_permanent_csv')).'" class="page-title-action">CSVをエクスポート</a>';
}
$post_type 是在這個檔案的頭部所取得的文章的類型。
在wp-content/themes/hcr/functions/admin.php
function export_permanent_csv()
{
$args = array(
'post_type' => 'aaa',
'numberposts' => -1,
'meta_key' => 'mark_id',
'orderby' => 'meta_value_num',
'order' => 'ASC',
);
$posts = get_posts($args);
if (empty($posts)) {
return;
}
$noNumber = 1;
foreach ($posts as $post) {
$metaData = get_post_meta($post->ID);
$data = [
$metaData['mark_id'][0],
$noNumber,
$post->post_title,
$metaData['prmnnt_address'][0],
$metaData['prmnnt_tel'][0],
$metaData['prmnnt_fax'][0],
$metaData['prmnnt_site'][0],
$metaData['prmnnt_time'][0],
$metaData['prmnnt_closing'][0],
$metaData['prmnnt_service'][0],
$metaData['prmnnt_class'][0],
$post->post_type,
];
$csv_output .= '"'.implode('","', $data).'"'."\n";
$noNumber++;
}
$csv_output .= "\n";
$filename = $file."_".date("Ymd", time());
header("Content-type: application/vnd.ms-excel");
header("Content-disposition: csv" . date("Y-m-d") . ".csv");
header("Content-disposition: filename=".$filename.".csv");
print $csv_output;
exit;
}
add_action('wp_ajax_export_permanent_csv', 'export_permanent_csv');