Tukukkk

I am new in WordPress so i need to display some data from database to a WordPress php page.

I add this code inside my functions.php (inside my installed theme)

function ws_count_completed_courses() {

$ws_current_user = get_current_user_id();

global $wpdb;



//Count completed courses for logged user.

$ws_completed_courses = $wpdb->get_results("SELECT COUNT(item_id) FROM 

$wpdb->user_items WHERE status = 'completed' AND used_id = 

$ws_current_user");

}

And after that inside my dashboard.php i have added the next code...

<p>The user has been finished <?php echo $ws_completed_courses ; ?> courses</p>

But i only see on website The user has been finished courses

Where is my mistake and how to solve the problem?

Thanks!

UPDATE 21-Nov-18

function.php

function ws_count_completed_courses() {

$ws_current_user = get_current_user_id();

var_dump($ws_current_user);

global $wpdb;    



$ws_completed_courses = $wpdb->get_results( "SELECT COUNT(item_id) FROM 

$wpdb->user_items WHERE status = 'completed' AND user_id = 

$ws_current_user" );



foreach ($ws_completed_courses as $course) {

$completedCourseCount = $course->user_item_id;

}

return $completedCourseCount;   

}

dashboard.php

<p>The user has been finished <?php echo ws_count_completed_courses(); ?> courses</p>

There are $wpdb tutorials you could google; but, here's a conceptual overview that might help get you started:

1. From a SQL prompt, make sure your query works. Then figure out how to adapt the SQL to use program variables in your PHP code.



2. 
   

   Take a look at the structure you are getting back from your query:

   
   
   

   var_dump($ws_current_user);

   
   


3. 
   

   There are lots of way to extract the data from the returned structure, but the most common approach is something like this:

   
   
   

   foreach ($ws_completed_courses as $course) {
$completedCourseCount = $course->colum_you_want;
}

   
   


4. 
   

   Return the value you extracted as the last line in your function:

   
   
   

   return $completedCourseCount;

   
   


5. 
   

   Call the function like this:

   
   
   

   echo ws_count_completed_courses();

   
   

$wpdb->get_results returns an array or an object. So try one of these:

echo $ws_completed_courses['COUNT(item_id)'];

echo $ws_completed_courses->COUNT(item_id);

EDIT: Ok, try this then:

function ws_count_completed_courses() {

 $ws_current_user = get_current_user_id();

 global $wpdb;    



 $ws_completed_courses = $wpdb->get_results( "SELECT COUNT(item_id) as user_item_id FROM $wpdb->user_items WHERE status = 'completed' AND user_id = $ws_current_user" );



 foreach ($ws_completed_courses as $course) {

   $completedCourseCount = $course->user_item_id;

 }

return $completedCourseCount;   

}