update mpdf lib version from 6 to 8

common/components/MpdfUtil.php

@@ -0,0 +1,41 @@
+<?php
+namespace common\components;
+
+use Mpdf\Mpdf;
+use yii\base\BaseObject;
+
+class MpdfUtil extends BaseObject
+{
+
+    // mpdf version 6 constructor
+    //function mPDF($mode='',$format='A4',$default_font_size=0,$default_font='',$mgl=15,$mgr=15,$mgt=16,$mgb=16,$mgh=9,$mgf=9, $orientation='P') {
+
+    public static function createMpdfWith6XConstructor($mode = '', $format = 'A4', $default_font_size = 0, $default_font = '', $mgl = 15, $mgr = 15, $mgt = 16, $mgb = 16, $mgh = 9, $mgf = 9, $orientation = 'P')
+    {
+        return self::createMpdf([
+            'mode' => $mode,
+            'format' => $format,
+            'default_font_size' => $default_font_size,
+            'default_font' => $default_font,
+            'margin_left' => $mgl,
+            'margin_right' => $mgr,
+            'margin_top' => $mgt,
+            'margin_bottom' => $mgb,
+            'margin_header' => $mgh,
+            'margin_footer' => $mgf,
+            'orientation' => $orientation
+        ]);
+    }
+
+    public static function createMpdf($options = [])
+    {
+        $mpdf = new Mpdf(
+            array_merge([
+                'mode' => 'utf-8',
+                'format' => 'A4'
+            ], $options)
+        );
+        return $mpdf;
+    }
+
+}