<?php
/**
 * @package PostByMeta
 * @version 1.0
 */
/*
Plugin Name: PostByMeta
Plugin URI: http://wordpress.org/plugins/hello-dolly/
Description: Generate shortcode for posts by desired meta
Author:remind
Version: 1.0
Author URI: null
*/
add_action( 'admin_menu', 'postsbymeta_menu' );
function pluginrender(){  // admin page bullshit
    ?>
    <div class="wrap">
        <h2>Posts By Meta Settings</h2><br>
        How many posts you like to display? <input type="text" disabled name="posts_count"><button>Set</button><br>
        Enter Your Meta Name <input type="text" disabled name="meta_name"><br>
        Enter Match Value <input type="text" name="match_value" disabled>
        <h4>Use Shortcode [poststoday] to render Posts</h4>


    </div>
    <?php
}
function postsbymeta_menu() { // adding menu
    add_menu_page('PostsByMeta', 'PostsByMeta', 'manage_options', 'my-menu', 'pluginrender' );}

 function renderPosts() { // rendering posts
    global $post;
$args = array(

     'post_type' => 'post',
     'meta_query'  => array(
            array(
                'key' => 'date',
                'value' => date('d-m-Y')
            )
        )

);
$lastposts = get_posts( $args );
foreach ( $lastposts as $post ) :
  setup_postdata( $post ); ?>
    <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>

<?php endforeach;
wp_reset_postdata();
}
add_shortcode('poststoday','renderPosts');