Yii2: create helper

How to create a new helper in Yii2 framework:

Create a new file “Utils.php” in “app-basic\helpers” or in other folder, location is up to you, but keep things organized!

<?php
namespace yii\helpers;
use Yii;
class Utils
{
public static function pre($mixed_data)
{ 
print '<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; 
white-space: -o-pre-wrap; 
background: #faf8f0; border: 1px solid silver; 
padding: 2px; font-weight: normal; font-family: Monospace, Courier">';
print_r($mixed_data);
print '</pre>'; 
}
public static function code($mixed_data)
{

print '<code style=" display: block; 
padding: 0.5em 1em; border: 1px solid #bebab0;">';
print_r($mixed_data);
print '</code>';
} 
}

In this helper we have 2 functions to display raw data.

Include this file in your entry script app-basic/web/index.php;

require(__DIR__ . '/../vendor/autoload.php');
require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/../helpers/utils.php');

Use these helpers in your view files:

 <?php Utils::pre(array("test"=>"array data", "boo"=>"echo"));?>
 <?php Utils::code(array("test"=>"test data", "boo"=>"echo"));?>