Những đoạn code hay dùng trong lập trình theme WordPress

<!-- Get post mặt định -->
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>

<?php endwhile; else : ?>
<p>Không có</p>
<?php endif; ?>
<!-- Get post mặt định -->

<!-- Get post News Query -->
<?php $getposts = new WP_query(); $getposts->query('post_status=publish&showposts=10&post_type=post&cat=1'); ?>
<?php global $wp_query; $wp_query->in_the_loop = true; ?>
<?php while ($getposts->have_posts()) : $getposts->the_post(); ?>

<?php endwhile; wp_reset_postdata(); ?>
<!-- Get post News Query -->

<!-- Get category -->
<?php $args = array(
'hide_empty' => 0,
'taxonomy' => 'category',
'orderby' => id,
);
$cates = get_categories( $args );
foreach ( $cates as $cate ) { ?>
<li>
<a href="<?php echo get_term_link($cate->slug, 'category'); ?>"><?php echo $cate->name ?></a>
</li>
<?php } ?>
<!-- Get category -->

add_action( 'init', 'register_my_menus' );
function register_my_menus(){
register_nav_menus(
array(
'main_nav' => 'Menu chính',
'link_nav' => 'Liên kết',
'info_nav' => 'Thông tin',
)
);
}

<?php wp_nav_menu(
array(
'theme_location' => 'main_nav',
'container' => 'false',
'menu_id' => 'header-menu',
'menu_class' => 'menu-main'
)
); ?>

if (function_exists('register_sidebar')){
register_sidebar(array(
'name'=> 'Cột bên',
'id' => 'sidebar',
));
}

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('sidebar') ) : ?><?php endif; ?>

<?php if(paginate_links()!='') {?>
<div class="quatrang">
<?php
global $wp_query;
$big = 999999999;
echo paginate_links( array(
'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
'format' => '?paged=%#%',
'prev_text' => __('«'),
'next_text' => __('»'),
'current' => max( 1, get_query_var('paged') ),
'total' => $wp_query->max_num_pages
) );
?>
</div>
<?php } ?>

add_action( 'after_setup_theme', 'wpdocs_theme_setup' );
function wpdocs_theme_setup() {
add_image_size( 'slider-thumb', 750, 375, true);
add_image_size( 'post-thumb', 300, 200, true);
add_image_size( 'tour-thumb', 270, 200, true);
add_image_size( 'video-thumb', 215, 130, true);
}

<!-- Get thumbnail -->
<?php echo get_the_post_thumbnail( $post_id, 'full', array( 'class' =>'thumnail') ); ?>
<!-- Get thumbnail -->

<!-- Hiển thị bài viết theo Tag -->
<div id="relatedposttags">
<?php
$tags = wp_get_post_tags($post->ID);
if ($tags)
{
$tag_ids = array();
foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
// lấy danh sách các tag liên quan
$args=array(
'tag__in' => $tag_ids,
'post__not_in' => array($post->ID), // Loại trừ bài viết hiện tại
'showposts'=>5, // Số bài viết bạn muốn hiển thị.
'caller_get_posts'=>1
);
$my_query = new wp_query($args);
if( $my_query->have_posts() )
{
echo '<h3>Bài viết liên quan</h3><ul>';
while ($my_query->have_posts())
{
$my_query->the_post();
?>
<li><a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>
<?php
}
echo '</ul>';
}
}
?>
</div>

<?php
$categories = get_the_category($post->ID);
if ($categories)
{
$category_ids = array();
foreach($categories as $individual_category) $category_ids[] = $individual_category->term_id;

$args=array(
'category__in' => $category_ids,
'post__not_in' => array($post->ID),
'showposts'=>5, // Số bài viết bạn muốn hiển thị.
'caller_get_posts'=>1
);
$my_query = new wp_query($args);
if( $my_query->have_posts() )
{
echo '<h3>Bài viết liên quan</h3><ul class="list-news">';
while ($my_query->have_posts())
{
$my_query->the_post();
?>
<li>
<div class="new-img"><a href="<?php the_permalink(); ?>"><?php the_post_thumbnail(array(85, 75)); ?></a></div>
<div class="item-list">
<h4><a href="<?php the_permalink() ?>" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></h4>
<?php the_excerpt(); ?>
</div>
</li>
<?php
}
echo '</ul>';
}
}
?>

function setpostview($postID){
$count_key ='views';
$count = get_post_meta($postID, $count_key, true);
if($count == ''){
$count = 0;
delete_post_meta($postID, $count_key);
add_post_meta($postID, $count_key, '0');
} else {
$count++;
update_post_meta($postID, $count_key, $count);
}
}
function getpostviews($postID){
$count_key ='views';
$count = get_post_meta($postID, $count_key, true);
if($count == ''){
delete_post_meta($postID, $count_key);
add_post_meta($postID, $count_key, '0');
return "0";
}
return $count;
}

<?php
setpostview(get_the_id());
?>

<?php
echo getpostviews(get_the_id());
?>

function teaser($limit) {
$excerpt = explode(' ', get_the_excerpt(), $limit);
if (count($excerpt)>=$limit) {
array_pop($excerpt);
$excerpt = implode(" ",$excerpt).'[...]';
} else {
$excerpt = implode(" ",$excerpt);
}
$excerpt = preg_replace('`\[[^\]]*\]`','',$excerpt);
return $excerpt.'...';
}

function get_link_img_post(){
global $post;
preg_match_all('/src="(.*)"/Us',get_the_content(),$matches);
$link_img_post = $matches[1];
return $link_img_post;
}