Cách tạo plugin WordPress siêu đơn giản nhờ AI

<?php
/**
* Plugin Name: HB Revisions
* Plugin URI: #
* Description: Đếm tổng số Post Revisions trong cơ sở dữ liệu WordPress.
* Version: 1.3.0
* Author: Hocban.vn
* License: GPL-2.0+
* Text Domain: hb-revisions
*/

if ( ! defined( 'ABSPATH' ) ) {
exit;
}

add_action( 'admin_menu', 'hbrev_register_menu' );
function hbrev_register_menu(): void {
add_menu_page(
'HB Revisions', 'HB Revisions', 'manage_options',
'hb-revisions', 'hbrev_render_page', 'dashicons-backup', 80
);
}

function hbrev_type_label( string $post_type ): array {
$system_types = [
'custom_css' => 'custom_css',
'customize_changeset' => 'customize_changeset',
'wp_global_styles' => 'global styles',
'wp_navigation' => 'navigation',
'wp_template' => 'template',
'wp_template_part' => 'template part',
'nav_menu_item' => 'nav menu',
'oembed_cache' => 'oembed',
'user_request' => 'user request',
'wp_block' => 'reusable block',
];

if ( isset( $system_types[ $post_type ] ) ) {
return [ 'label' => $system_types[ $post_type ], 'system' => true ];
}

$map = [
'post' => 'post',
'page' => 'page',
];

return [
'label' => $map[ $post_type ] ?? $post_type,
'system' => false,
];
}

function hbrev_count(): int {
global $wpdb;
return (int) $wpdb->get_var(
"SELECT COUNT(*) FROM {$wpdb->posts} WHERE post_type = 'revision'"
);
}

function hbrev_size_kb(): float {
global $wpdb;
$bytes = (float) $wpdb->get_var(
"SELECT SUM(
LENGTH(post_content) + LENGTH(post_title) +
LENGTH(post_excerpt) + LENGTH(post_name)
)
FROM {$wpdb->posts}
WHERE post_type = 'revision'"
);
return $bytes / 1024;
}

function hbrev_format_size( float $kb ): string {
if ( $kb >= 1024 ) {
return number_format( $kb / 1024, 2 ) . ' MB';
}
return number_format( $kb, 1 ) . ' KB';
}

function hbrev_get_posts( int $limit = 50, int $offset = 0 ): array {
global $wpdb;
return $wpdb->get_results(
$wpdb->prepare(
"SELECT
p.ID,
p.post_title,
p.post_type,
p.post_modified,
COUNT(r.ID) AS revision_count
FROM {$wpdb->posts} p
INNER JOIN {$wpdb->posts} r
ON r.post_parent = p.ID AND r.post_type = 'revision'
WHERE p.post_type != 'revision'
GROUP BY p.ID
ORDER BY revision_count DESC
LIMIT %d OFFSET %d",
$limit,
$offset
),
ARRAY_A
);
}

function hbrev_total_posts_with_rev(): int {
global $wpdb;
return (int) $wpdb->get_var(
"SELECT COUNT(DISTINCT post_parent)
FROM {$wpdb->posts}
WHERE post_type = 'revision' AND post_parent > 0"
);
}

add_action( 'admin_post_hbrev_cleanup', 'hbrev_do_cleanup' );
function hbrev_do_cleanup(): void {
if ( ! current_user_can( 'manage_options' ) ) {
wp_die( 'Không có quyền.' );
}
check_admin_referer( 'hbrev_cleanup_nonce' );

global $wpdb;

$wpdb->query( "DELETE FROM {$wpdb->posts} WHERE post_type = 'revision'" );

$wpdb->query(
"DELETE pm FROM {$wpdb->postmeta} pm
LEFT JOIN {$wpdb->posts} p ON pm.post_id = p.ID
WHERE p.ID IS NULL"
);

wp_redirect( admin_url( 'admin.php?page=hb-revisions&hbrev_done=1' ) );
exit;
}

function hbrev_styles(): void {
echo '
<style>
.hbrev-wrap {
max-width: 900px;
margin: 32px 20px 0;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.hbrev-summary {
display: flex;
gap: 16px;
margin-bottom: 28px;
flex-wrap: wrap;
}
.hbrev-stat {
flex: 1;
min-width: 160px;
background: #fff;
border-radius: 10px;
box-shadow: 0 1px 8px rgba(0,0,0,.07);
padding: 22px 24px;
text-align: center;
}
.hbrev-stat .val {
font-size: 42px;
font-weight: 700;
color: #2271b1;
line-height: 1;
display: block;
}
.hbrev-stat .lbl {
font-size: 12px;
color: #72777c;
margin-top: 6px;
display: block;
}
.hbrev-cleanup-card {
flex: 1;
min-width: 160px;
background: #fff;
border-radius: 10px;
box-shadow: 0 1px 8px rgba(0,0,0,.07);
padding: 22px 24px;
text-align: center;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
gap: 10px;
}
.hbrev-cleanup-card .lbl { font-size: 12px; color: #72777c; }
.hbrev-btn-delete {
display: inline-block;
background: #d63638;
color: #fff !important;
font-size: 13px;
font-weight: 600;
border: none;
border-radius: 6px;
padding: 9px 20px;
cursor: pointer;
text-decoration: none;
transition: background .15s;
}
.hbrev-btn-delete:hover { background: #b32d2e; color: #fff !important; }
.hbrev-notice {
background: #edfaef;
border-left: 4px solid #00a32a;
border-radius: 6px;
padding: 12px 16px;
margin-bottom: 20px;
font-size: 13px;
color: #1d6a2e;
}

/* Bảng */
.hbrev-table-wrap {
background: #fff;
border-radius: 10px;
box-shadow: 0 1px 8px rgba(0,0,0,.07);
overflow: hidden;
}
.hbrev-table-head {
display: flex;
align-items: center;
justify-content: space-between;
padding: 16px 20px;
border-bottom: 1px solid #f0f0f1;
}
.hbrev-table-head h2 { font-size: 14px; font-weight: 600; color: #1d2327; margin: 0; }
.hbrev-table-head span { font-size: 12px; color: #72777c; }

table.hbrev-table { width: 100%; border-collapse: collapse; font-size: 13px; }
table.hbrev-table thead th {
background: #f6f7f7;
color: #50575e;
font-weight: 600;
font-size: 11px;
text-transform: uppercase;
letter-spacing: .4px;
padding: 10px 16px;
text-align: left;
border-bottom: 1px solid #e0e0e0;
}
table.hbrev-table thead th.col-num { width: 48px; text-align: center; }
table.hbrev-table thead th.col-rev { width: 110px; text-align: center; }
table.hbrev-table thead th.col-type { width: 120px; }
table.hbrev-table thead th.col-date { width: 140px; }

table.hbrev-table tbody tr { border-bottom: 1px solid #f0f0f1; transition: background .1s; }
table.hbrev-table tbody tr:last-child { border-bottom: none; }
table.hbrev-table tbody tr:hover { background: #f8f9fa; }
table.hbrev-table td { padding: 11px 16px; color: #1d2327; vertical-align: middle; }
table.hbrev-table td.col-num { text-align: center; color: #a0a5aa; font-size: 12px; }
table.hbrev-table td.col-rev { text-align: center; }

.hbrev-badge {
display: inline-block;
color: #fff;
font-size: 12px;
font-weight: 700;
border-radius: 20px;
padding: 2px 10px;
min-width: 32px;
text-align: center;
}
.hbrev-badge.high { background: #d63638; }
.hbrev-badge.med { background: #dba617; }
.hbrev-badge.low { background: #2271b1; }

.hbrev-title a { color: #2271b1; text-decoration: none; font-weight: 500; }
.hbrev-title a:hover { text-decoration: underline; }
.hbrev-title .post-id { font-size: 11px; color: #a0a5aa; margin-left: 6px; }

.hbrev-type {
display: inline-block;
font-size: 11px;
border-radius: 4px;
padding: 2px 7px;
}
.hbrev-type.is-content {
background: #e8f0fb;
color: #2271b1;
}
.hbrev-type.is-system {
background: #f0f0f1;
color: #72777c;
}

.hbrev-date { color: #72777c; font-size: 12px; }
.hbrev-pagination {
padding: 14px 20px;
border-top: 1px solid #f0f0f1;
text-align: right;
font-size: 12px;
color: #72777c;
}
.hbrev-pagination a { color: #2271b1; text-decoration: none; margin-left: 10px; }
.hbrev-pagination a:hover { text-decoration: underline; }
.hbrev-footer { margin-top: 16px; font-size: 12px; color: #a0a5aa; text-align: center; }
</style>
';
}

function hbrev_render_page(): void {
if ( ! current_user_can( 'manage_options' ) ) {
wp_die( esc_html__( 'Bạn không có quyền truy cập trang này.', 'hb-revisions' ) );
}

$per_page = 50;
$current_page = isset( $_GET['hbrev_page'] ) ? max( 1, (int) $_GET['hbrev_page'] ) : 1;
$offset = ( $current_page - 1 ) * $per_page;

$total_rev = hbrev_count();
$total_posts_rev = hbrev_total_posts_with_rev();
$size_str = hbrev_format_size( hbrev_size_kb() );
$rows = hbrev_get_posts( $per_page, $offset );
$total_pages = $total_posts_rev > 0 ? (int) ceil( $total_posts_rev / $per_page ) : 1;
$done = isset( $_GET['hbrev_done'] );

hbrev_styles();
?>
<div class="wrap hbrev-wrap">

<?php if ( $done ) : ?>
<div class="hbrev-notice">
Đã dọn dẹp xong! Tất cả revisions đã được xóa khỏi database.
</div>
<?php endif; ?>

<div class="hbrev-summary">
<div class="hbrev-stat">
<span class="val"><?php echo number_format( $total_rev ); ?></span>
<span class="lbl">Tổng số Revisions</span>
</div>
<div class="hbrev-stat">
<span class="val" style="font-size:32px;"><?php echo esc_html( $size_str ); ?></span>
<span class="lbl">Tổng dung lượng Revisions</span>
</div>
<div class="hbrev-cleanup-card">
<span class="lbl">Xóa toàn bộ revisions khỏi database</span>
<?php if ( $total_rev > 0 ) : ?>
<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>"
onsubmit="return confirm('Bạn có chắc muốn xóa toàn bộ <?php echo number_format( $total_rev ); ?> revisions không? Hành động này không thể hoàn tác.');">
<input type="hidden" name="action" value="hbrev_cleanup">
<?php wp_nonce_field( 'hbrev_cleanup_nonce' ); ?>
<button type="submit" class="hbrev-btn-delete">🗑 Dọn dẹp Revisions</button>
</form>
<?php else : ?>
<span style="font-size:13px;color:#00a32a;font-weight:600;"> Database đang sạch</span>
<?php endif; ?>
</div>
</div>

<div class="hbrev-table-wrap">
<div class="hbrev-table-head">
<h2>📋 Danh sách mục — sắp xếp theo số Revision</h2>
<span>Trang <?php echo $current_page; ?> / <?php echo $total_pages; ?></span>
</div>

<?php if ( empty( $rows ) ) : ?>
<p style="padding:24px 20px;color:#72777c;margin:0;">Không có bài viết nào có revision.</p>
<?php else : ?>
<table class="hbrev-table">
<thead>
<tr>
<th class="col-num">#</th>
<th>Tiêu đề</th>
<th class="col-type">Loại</th>
<th class="col-rev">Revisions</th>
<th class="col-date">Sửa lần cuối</th>
</tr>
</thead>
<tbody>
<?php foreach ( $rows as $i => $row ) :
$stt = $offset + $i + 1;
$count = (int) $row['revision_count'];
$badge = $count >= 20 ? 'high' : ( $count >= 10 ? 'med' : 'low' );
$title = $row['post_title'] ?: '(Không có tiêu đề)';
$date = mysql2date( 'd/m/Y H:i', $row['post_modified'] );
$type_info = hbrev_type_label( $row['post_type'] );
$pill_class = $type_info['system'] ? 'is-system' : 'is-content';
$pill_text = $type_info['system']
? '(hệ thống) ' . $type_info['label']
: '(' . $type_info['label'] . ')';
$edit_url = $type_info['system'] ? null : get_edit_post_link( $row['ID'] );
?>
<tr>
<td class="col-num"><?php echo $stt; ?></td>
<td class="hbrev-title">
<?php if ( $edit_url ) : ?>
<a href="<?php echo esc_url( $edit_url ); ?>" target="_blank">
<?php echo esc_html( $title ); ?>
</a>
<?php else : ?>
<?php echo esc_html( $title ); ?>
<?php endif; ?>
<span class="post-id">ID: <?php echo (int) $row['ID']; ?></span>
</td>
<td>
<span class="hbrev-type <?php echo $pill_class; ?>">
<?php echo esc_html( $pill_text ); ?>
</span>
</td>
<td class="col-rev">
<span class="hbrev-badge <?php echo $badge; ?>"><?php echo $count; ?></span>
</td>
<td class="hbrev-date"><?php echo esc_html( $date ); ?></td>
</tr>
<?php endforeach; ?>
</tbody>
</table>

<?php if ( $total_pages > 1 ) : ?>
<div class="hbrev-pagination">
<?php
$base = admin_url( 'admin.php?page=hb-revisions' );
if ( $current_page > 1 ) {
printf( '<a href="%s">← Trước</a>', esc_url( $base . '&hbrev_page=' . ( $current_page - 1 ) ) );
}
echo ' Trang ' . $current_page . ' / ' . $total_pages . ' ';
if ( $current_page < $total_pages ) {
printf( '<a href="%s">Tiếp →</a>', esc_url( $base . '&hbrev_page=' . ( $current_page + 1 ) ) );
}
?>
</div>
<?php endif; ?>
<?php endif; ?>
</div>

<p class="hbrev-footer">HB Revisions v1.3.0 &nbsp;·&nbsp; Dữ liệu thời gian thực từ database</p>
</div>
<?php
}