Displaying values on hook_form

Question

I'm displaying a form on admin url :admin/settings/custom. In the page argument I pass array('custom_admin_form'), to the menu item. In the form function I'm writing form elements to display folder and file names present in the public folder. I get those values through the code below:

$dir_path = variable_get('file_public_path', conf_path(). '/files') ;
$fileslist = glob($dir_path . "*.*"); 
$dirs = glob($dir_path . '/*' , GLOB_ONLYDIR);
foreach($dirs as $directs){
     $names = explode('/', $directs);
     $fnames[] = end($names);
}

How can I display the results in the form function? I tried it using print, echo, drupal_render but nothing is working. I've also used #markup element, but it was displaying array(), not the values of array.

Answer 1

You can try something like this:

 $form['sample'] = array(
     '#type' => 'item',
     '#markup' => print_r($sample_values, TRUE),        
 ); 

or simply just

print_r($sample_values);

or install Devel module and use dsm function.

dsm($sample_values);

UPDATE:

Try this:

$form['sample'] = array(
    '#type' => 'item',
    '#markup' => print_array_values($sample_values),        
); 

Then declare the function below:

function print_array_values($sample_values){
    $content = '';
    foreach($sample_values as $val){
            $content .= '<div>' . $val . '</div>';
    }

    return $content;
}

Answer 2

I would suggest dpm or dsm or kpr, which is very common among Drupal developer for printing variables to debug in Drupal 7. But you need to enable Devel module in your site first as @AlyssaGono suggested.

If you want to use something not depends on other module, you can use var_dump().

Example:

var_dump($variable);
drupal_exit();