Kinh nghiệm wordpress

// file style.css
/*
Plugin Name: HTML5Aerial
Description: Theme learn
Version: 1.0
Author: Trong Hao
Text Domain: Udemy
*/

<?php
//setup
define( 'JA_DEV_MODE', true );

//includes
include( get_theme_file_path('/duongdantuthumucChuatheme') );

//hooks
add_action('wp_enqueue_scripts', 'tenHam');

//shortcodes

//dat ten them tien to j + ten theme + _ tenham
ju_enqueue // theme Udemy

function ju_enqueue() {
	$uri = get_theme_file_uri();
  
    // xoa cache trinh duyet khi dev
  	// khi deploy edit define => false
    $version = JA_DEV_MODE ? time() : false;

	wp_register_style( 'main', $uri . '/assets/css/main.css', [], $version );
	wp_register_style( 'datTen1', 'http://....' );
	wp_register_style( 'datTen2', $uri . 'duongDan', ['datTen1'] );
	//tham so thu 3: xac dinh cai nao tai truoc (datTen1 tai truoc datTen2). Tham so thu 3 co the k co cung dc
	
	wp_enqueue_style( 'datTen1' );
	wp_enqueue_style( 'datTen2' );
	// => header cac trang su dung them <php wp_head(); ?>

	wp_register_script( 'datTen3', $uri . 'duongDan', ['...'], false, true/$version );
	// tham so thu 3 nhu style, 
	// tham so thu 4: phien ban cua script. False => khong su dung phien ban
	wp_enqueue_style( 'datTen3' );
}

// functions.php
add_action( 'after_setup_theme', 'tenHam' );

function tenHam() {
	register_nav_menu( 'tenMenu', __( 'Mota', 'textDomain') );
}

// chỗ cần gắn menu vào
if ( has_nav_menu( 'tenMenu' ) ) {
	wp_nav_menu([
		'theme_location' 	=> 'tenMenu',
		'container' 		=> false, //the bao boc menu
		'menu_class' 		=> '',
		'fallback_cp'		=> false, //hien thi menu mac dinh
		'depth'				=> 4  // bao nhieu cap menu
	]);
}

if ( has_nav_menu( 'tenMenu' ) ) {
	wp_nav_menu([
		'theme_location' 	=> 'tenMenu',
		'container' 		=> false, //the bao boc menu
		'menu_class' 		=> '',
		'fallback_cp'		=> false, //hien thi menu mac dinh
		'depth'			=> 4  // bao nhieu cap menu,
		'walker' 		=> new TenClass()
	]);
}

class TenClass extends Walker_Nav_Menu {
	public function start_lvl( &$output, $depth = 0, $args = [] ) {
		$output		.= '<ul class="special-class">';	
	}
	
	public function start_el( &$output, $item, $depth = 0, $args = [], $id = 0 ) {
		$output		.= '<li class="special-class-item">';
		$output		.= $args->before;
		$output		.= '<a href="' . $item->url . '">';
		$output		.= $args->link_before . $item->title . $args->link_after;
		$output		.= '</a>';
		$output		.= $args->after;	
	}

	public function end_el( &$output, $item, $depth = 0, $args = [], $id = 0 ) {
		$output		.= '</li>';	
	}

	public function end_lvl( &$output, $depth = 0, $args = [] ) {
		$output		.= '</ul>';	
	}
}

// functions.php

//includes
include( get_theme_file_path('/includes/custom-nav.php') );

<?php get_header(); ?> 		// => header.php
<?php get_header( 'v2' ); ?>// => header-v2.php
<?php get_footer(); ?>		// => footer.php

<?php body_class( 'tenClass1 tenClass2' ); ?>

add_action( 'widgets_init', 'tenHam' );

function tenHam() {
	register_sidebar([
		'name'		=> __('tenSideBar', 'text_domain'),
		'id'		=> 'datTenDuyNhatKhongTrung',
		'description'	=> __('mota', 'text_domain'),
		'before_widget'	=> '<div id="%1$s" class="widget cleafix %2$s"',
		'after_widget'	=> '</div>',
		'before_title'	=> '<h4>',
		'after_title'	=> '</h4>'
	]);
}

<?php get_sidebar(); ?>

<?php

    if ( is_active_sidebar( 'js_sidebar_custom' ) ) {
        dynamic_sidebar( 'js_sidebar_custom' );
    }

?>

<?php $unique_id = esc_attr( uniqid( 'search-form-' ) ); ?>

<form role="search" method="get" class="search-form" 
      action="<?php echo esc_url( home_url( '/' ) ); ?>">
	<div class="input-group">
		<input type="search" id="<?php echo $unique_id; ?>" 
		       class="form-control" 
		       name="s"  
		       placeholder="<?php esc_attr_e( 'Search', 'text_domain' ); ?>" />
		<span class="input-group-btn">
			<button type="submit" class="btn btn-danger"><i class="icon-search"></i></button>
		</span>
	</div>
</form>

add_theme_support( 'post-thumbnails' );

<?php
  if( have_posts() ) {
    	while( have_posts() ) {
     		the_post();
      		?>
        		<div> blog post item </div>
        	<?php
      	}
  }
?>

get_template_part( 'tenChuan', 'custom' );  //tenChuan-custom.php

// thumbnail
if ( has_post_thumbnail() ) {
	the_post_thumbnail( 'full', [  // medium, large, thumbnail
		 'class' => 'tenClass' 
	]);
}

// title
<?php the_title(); ?>
<?php the_title( '<h2>', '</h2>' ); ?>

// link blog post item
<?php the_permalink(); ?>

// date blog post item
<?php echo get_the_date(); ?>

// author
<?php the_author(); ?>
  // get link author
<?php echo get_author_posts_url( get_the_author_meta('ID') );  //co the thay ID thanh truong muon lay ?>

// category of blog post item
<?php the_category( ' ' );   // dau phan cach cac category o day la space ?>

// comment number
<?php comments_number( '0' ); ?>

// trích dẫn
<?php the_excerpt(); ?>

previous_post_link( 'Text hiển thị' );
next_posts_link( 'Text hiển thị' );

//post
single-{post-type}-{slug}.php (single-post-hello.php)
single-{post-type}.php (single-post.php)
single.php
singular.php
index.php

if( have-post() ) {
	while( have_post() ) {
		the_post();
		
		global $post;
		$author_ID = $post->post_author;
		$author_URL = $post->get author_posts_url( $author_ID );

		the_title();
		get_the_date();
		the_content();
		the_tags();


		$default = array(
			'before' => '<p>',
			'after' => ''</p>
		);
		wp_link_pages($default);
		
	}

}

///comment
if( post_password_required() ) {
	return;
}


comment_form([
	'comment_field' => '<div>...',
	'fields' => [
		'email' => '<div class="">
				<lable>'. __('text', 'text-domain') . '</label>
				<input class=""/>',
	],
	'class_submit' => ''
	'label_submit' => __('text', 'text-domain'),
	'title_reply' => __('text', 'text-domain')
]);


if ( have_comments() ) {

}
foreach ($comments as $comment) {
	get_avatar( $comment, 60, '', '', [ 'class' => '' ]);
	// 60 : kích thước
	comment_author();
	comment_date();
	comment_text();

}

the_comments_pagination();

if( comments_open() || get_comments_number() ) {
	
}

////template tags
the_author();
get_avatar( $author_ID, 90, '', '', [ 'class' => ]); // 90: size
get_the_author_meta( field ); // len codex.wordpress.org
nl2br( get_the_author_meta( 'description' ) ) // hàm xuống dòng khi khi đọc cục html

//Related post using WP_Query
$categories 		= get_the_category();
$rp_query 		= new WP_Query([
	'posts_per_page'=> 2,
	'post_not_in' 	=> [ $post->ID ],
	'cat' 		=> !empty( $categories ? $categories[0]->term_id: null)
]);

if( $rp_query->have_post() ) {
	while( $rp_query->have_post() ) {
		$rp_query->the_post();
		
		if( has_post_thumbnail() ) {
			the_post_thumbnail( 'thumbnail' );
		}

		...
		// su dung nhu blog single
	}
	wp_reset_post_data();
}

//page template
page-{slug}.php
page-{id}.php
page.php
singular.php
index.php

while( have_posts() ) {
	the_post();
	
}

rewind_post(); //giống break

//plugin tạo subtitle: 
			//        ==>  WP Subtitle
single_post_title()
if ( function_exists( 'the_subtitle' ) ) {
	the_subtitle();
}

global $wp_query;

$started_over = false;

while ( have_posts() ) : the_post();
    the_title();

    if ( ! $started_over && $wp_query->current_post == 2 ) {
        $started_over = true;
        rewind_posts();
    }
endwhile;

//404
get_search_form(); 

//category template
category-{slug}.php
category-{id}.php
category.php
archive.php
index.php

the_archive_title();
the_archive_description();

//date Template
date.php
archive.php
index.php

if( is_year() ) {

} else if( is_month() ) {

} else if( is_day() ) {

} 

//Attachment Template  ==> image or file upload<br>
{MIME-type}.php<br>
attachment.php<br>
single-attachment-{slug}.php<br>
single.php<br>
singular.php<br>
index.php

//search
the_search_query();
get_search_form();

/*
* Template Name: tenTemplate
*/

//title , logo
function ju_setup_theme() {
	add_theme_support('title-tag');
	add_theme_support('custom-logo');
}

if( has_custom_logo ) {
	the_custom_logo();
} else {
	//logo default
}

get_bloginfo('param');
get_bloginfo('name');

// hien thi quang cao
	//..==> plugin: AdSense Plugin WP QUADS

add_menu_page ($page_title, $menu_title, $capability, $menu_slug, $function = '', $icon_url = '', $position = null );

function add_admin_menu()
{
    add_menu_page (
            'Plugin Options', 
            'Plugin Options', 
            'manage_options', 
            'plugin-options', 
            'show_plugin_options', 
            '', 
            '2'
    );
}
 
function show_plugin_options()
{
    echo '<h1>Đây là trang Plugin Options</h1>';
}
 
add_action('admin_menu', 'add_admin_menu');

add_submenu_page ($parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function = '' );

function add_admin_submenu()
{
    add_submenu_page ('plugin-options', 'General Settings', 'General Settings', 'manage_options', 'plugin-options-general-settings', 'show_general_setting_page' );
    add_submenu_page ('plugin-options', 'Advanced Settings', 'Advanced Settings', 'manage_options', 'plugin-options-advanced-settings', 'show_advanced_setting_page' );
}
 
function show_general_setting_page()
{
    echo '<h1>Đây là trang Plugin Options - General Settings</h1>';
}
 
function show_advanced_setting_page()
{
    echo '<h1>Đây là trang Plugin Options - Advanced Settings</h1>';
}
 
add_action('admin_menu', 'add_admin_submenu');

function remove_menu()
{
    remove_menu_page('themes.php');
}
 
add_action('admin_menu', 'remove_menu');

function remove_submenu()
{
    remove_submenu_page('users.php', 'user-new.php');
}
 
add_action('admin_menu', 'remove_submenu');

//create, alter, drop table
function createTableWorkTag() {
    global $wpdb; 
    $wpdb->query( 
       
            "
                DROP TABLE IF EXISTS " . $wpdb->prefix . "works_tag
            "

    );
    $wpdb->query( 
       
            "
                CREATE TABLE `" . $wpdb->prefix . "works_tag` (
                `id` int(11) NOT NULL,
                `name` text NOT NULL,
                `status` bigint(20) NOT NULL,
                `count` int(11) NOT NULL
                ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
            "

    );
    $wpdb->query( 
       
            "
                ALTER TABLE `" . $wpdb->prefix . "works_tag` 
                CHANGE `id` `id` INT(11) NOT NULL AUTO_INCREMENT, add PRIMARY KEY (`id`);
            "

    );


}

// insert
public function postForm( $name, $status, $count ) {
  global $wpdb; 
  $wpdb->insert( $wpdb->prefix . "works_tag", array(
    'name' => $name,
    'status' => $status,
    'count' => $count, 
  ),
               );
}

// get data
public function getDataWorksTag() {
  global $wpdb; 
  return $wpdb->get_results(
    "SELECT * FROM " . $wpdb->prefix . "works_tag"
  );
}

<link rel="stylesheet" href="<?php echo content_url(); ?>/themes/blankslate/src/public/css/custom.css">
<script src="<?php echo content_url(); ?>/themes/blankslate/src/public/js/custom.js">

 case 'delete':
global $wpdb;
$wpdb->delete( $wpdb->prefix. 'test2', array( 'ID' => $_GET['id'] ) );
$template = dirname( __FILE__ ) . '/views/crud-list.php';
break;

// dòng 3 change thành tên table database