نحوه ساختن ابزارک سفارشی در وردپرس

<?php
/*
Plugin Name: My Widget
Plugin URI: http://wordpress.org/extend/plugins/#
Description: This is an example plugin
Author: Your Name
Version: 1.0
Author URI: http://example.com/
*/

// register My_Widget
add_action( 'widgets_init', function(){
register_widget( 'My_Widget' );
});

class My_Widget extends WP_Widget {
// class constructor
public function __construct() {}

// output the widget content on the front-end
public function widget( $args, $instance ) {}

// output the option form field in admin Widgets screen
public function form( $instance ) {}

// save options
public function update( $new_instance, $old_instance ) {}
}

public function __construct() {
$widget_ops = array(
'classname' => 'my_widget',
'description' => 'A plugin for Kinsta blog readers',
);
parent::__construct( 'my_widget', 'My Widget', $widget_ops );
}

public function form( <span class="hljs-variable">$instance</span> ) { <span class="hljs-variable">$title</span> = ! empty( <span class="hljs-variable">$instance</span>[<span class="hljs-string">'title'</span>] ) ? <span class="hljs-variable">$instance</span>[<span class="hljs-string">'title'</span>] : esc_html__( <span class="hljs-string">'Title'</span>, <span class="hljs-string">'text_domain'</span> ); ?> <p> <label <span class="hljs-keyword">for</span>=<span class="hljs-string">"<?php echo esc_attr( <span class="hljs-variable">$this</span>->get_field_id( 'title' ) ); ?>"</span>> <?php esc_attr_e( <span class="hljs-string">'Title:'</span>, <span class="hljs-string">'text_domain'</span> ); ?> </label> <input class=<span class="hljs-string">"widefat"</span> id=<span class="hljs-string">"<?php echo esc_attr( <span class="hljs-variable">$this</span>->get_field_id( 'title' ) ); ?>"</span> name=<span class="hljs-string">"<?php echo esc_attr( <span class="hljs-variable">$this</span>->get_field_name( 'title' ) ); ?>"</span> <span class="hljs-built_in">type</span>=<span class="hljs-string">"text"</span> value=<span class="hljs-string">"<?php echo esc_attr( <span class="hljs-variable">$title</span> ); ?>"</span>> </p> <?php }

public function form( $instance ) {

$posts = get_posts( array(
'posts_per_page' => 20,
'offset' => 0
) );
$selected_posts = ! empty( $instance['selected_posts'] ) ? $instance['selected_posts'] : array();
?>
<div style="max-height: 120px; overflow: auto;">
<ul>
<?php foreach ( $posts as $post ) { ?>

<li><input
type="checkbox"
name="<?php echo esc_attr( $this->get_field_name( 'selected_posts' ) ); ?>[]"
value="<?php echo $post->ID; ?>"
<?php checked( ( in_array( $post->ID, $selected_posts ) ) ? $post->ID : '', $post->ID ); ?> />
<?php echo get_the_title( $post->ID ); ?></li>

<?php } ?>
</ul>
</div>
<?php
}

public function update( $new_instance, $old_instance ) {
$instance = array();
$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';

$selected_posts = ( ! empty ( $new_instance['selected_posts'] ) ) ? (array) $new_instance['selected_posts'] : array();
$instance['selected_posts'] = array_map( 'sanitize_text_field', $selected_posts );

return $instance;
}

public function widget( $args, $instance ) {
echo $args['before_widget'];
if ( ! empty( $instance['title'] ) ) {
echo $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ) . $args['after_title'];
}

if( ! empty( $instance['selected_posts'] ) && is_array( $instance['selected_posts'] ) ){

$selected_posts = get_posts( array( 'post__in' => $instance['selected_posts'] ) );
?>
<ul>
<?php foreach ( $selected_posts as $post ) { ?>
<li><a href="<?php echo get_permalink( $post->ID ); ?>">
<?php echo $post->post_title; ?>
</a></li>
<?php } ?>
</ul>
<?php

}else{
echo esc_html__( 'No posts selected!', 'text_domain' );
}

echo $args['after_widget'];
}