how to make make shortcode of page/post in wordpress

Copy and paste this code in your function.php file

<?php
function digwp_includeContentShortcode($atts) {
  
  $thepostid = intval($atts[postidparam]);
  $output = '';

  query_posts("p=$thepostid&post_type=page");
  if (have_posts()) : while (have_posts()) : the_post();
    $output .= get_the_content($post->ID);
  endwhile; else:
    // failed, output nothing
  endif;
  wp_reset_query();

  return $output;

}

// USAGE
/*  In the post content, you can use 

[postPage_include postidparam="1234"]
"1234" would be the WordPress ID of the Page you are 

trying to include  */
add_shortcode("postPage_include", "digwp_includeContentShortcode");
?>

Method for use in post or page in back-end :-
[postPage_include postidparam="1234"]
"1234" would be the WordPress ID of the Page you are
Method for use in post or page in template :-
echo do_shortcode( '[postPage_include postidparam="1234"]' );

Create a custom widget and call it by using shortcode in wordpress

Copy code in functions.php

<?php
function widget($atts) {
    
    global $wp_widget_factory;
    
    extract(shortcode_atts(array(
        'widget_name' => FALSE
    ), $atts));
    
    $widget_name = wp_specialchars($widget_name);
    
    if (!is_a($wp_widget_factory->widgets[$widget_name], 'WP_Widget')):
        $wp_class = 'WP_Widget_'.ucwords(strtolower($class));
        
        if (!is_a($wp_widget_factory->widgets[$wp_class], 'WP_Widget')):
            return '
'.sprintf(__("%s: Widget class not found. Make sure this widget exists and the class name is correct"),''.$class.'').'
';
        else:
            $class = $wp_class;
        endif;
    endif;
    
    ob_start();
    the_widget($widget_name, $instance, array('widget_id'=>'arbitrary-instance-'.$id,
        'before_widget' => '',
        'after_widget' => '',
        'before_title' => '',
        'after_title' => ''
    ));
    $output = ob_get_contents();
    ob_end_clean();
    return $output;
    
}
add_shortcode('widget','widget'); 
?>

Usage
Now in Post/Page content, you can use the widget just by referencing it by name:
[widget widget_name="Your_Custom_Widget"]
enjoy!!

use shortcodes within a WordPress Text widget

By default, WordPress shortcodes do not work within Text widgets. If you need this functionality, it is quite easy to accomplish, simply follow the steps below.

1. Log into your WordPress Dashboard
2. Under "Appearance" click "Editor"
3. In the list of files on the right of the page, click "functions.php"
4. At the bottom of the functions.php file, add the following code:
   add_filter( 'widget_text', 'shortcode_unautop');
   add_filter( 'widget_text', 'do_shortcode');
   Click "Update File" and your shortcodes should now work in your Text widgets!

how to make shortcode of custome field type in wordpress

1. Copy this php script in your functions.php
function field_scode($value){
global $post;
$name = $value['name'];
if(empty($name)) return;
return get_post_meta($post->ID,$name,true);
}
add_shortcode('my_shortcode','field_scode');
/* use this shortcode in your post or page or in template
exp:- [my_shortcode  name="put_field_name_here"]
*/

Php script for file download

1. PHP Script for image download you can make any file to to download Paste this script in your file or save it download.php

<?php
$imageurl = filter_input(INPUT_GET, 'imageurl', FILTER_SANITIZE_URL);
// Clean the image URL to get the path and make sure the user is just getting an image.
$url_parsed = parse_url($imageurl);
$file = $_SERVER['DOCUMENT_ROOT'] .'/base-directory'. $url_parsed['path'];
print_r($file);
// Get the extension of the file.
$extension = substr(strrchr($file ,'.'), 1);

// Limit the extensions in this array to those you're allowing the user to download.

$allowed_extensions = array('jpg', 'jpeg', 'png', 'gif');

// Make sure the file requested is in your list of allowed extensions to make sure the user isn't downloading something other than an image.

if (in_array(strtolower($extension), $allowed_extensions)) {

    if (file_exists($file)) {

        header ('Content-type: octet/stream');

        header ('Content-disposition: attachment; filename=' . basename($file) . ';');

        header('Content-Length: ' . filesize($file));

         ob_clean();
        readfile($file);
    }
}
?>

1. HTML Code Paste this code in your html file

    Download  
	

Enjoy......