Detailed explanation of how to add custom buttons and export csv in wordpress

The following tutorial column of WordPress will introduce to you how to add custom buttons and export csv in the WordPress background. I hope it will be helpful to friends in need!

Wordpress background adds a custom button to export csv

Find the following code in wp-admin/edit.php :

<?php
if ( current_user_can( $post_type_object->cap->create_posts ) ) {
    echo ' <a href="&#39; . esc_url( admin_url( $post_new_file ) ) . &#39;" class="page-title-action">' . esc_html( $post_type_object->labels->add_new ) . '</a>';
}

Add the following code to the next line of the above code:

if ($post_type == 'aaa') {
    echo ' <a href="&#39;.esc_url( admin_url(&#39;admin-ajax.php?action=export_permanent_csv&#39;)).&#39;" class="page-title-action">CSVをエクスポート</a>';
}

$post_type is the type of article obtained from the header of this file.
In 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');

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