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wordpress 后台添加自定义按钮导出csv

在wp-admin/edit.php中找到如下代码：

<?phpif ( 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>';}

在上面代码的下一行加入如下代码：

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 是在这个文件的头部获取的文章的类型。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');