How can I use php mpdf, can not Chinese garbled code? - mpdf

Question

This is my php code, use dPdf, But the PDF I got was garbled in Chinese，like this:
I tried many methods, but they didn't work， My MPDF version is 8.0.8, php verson is v7.4
<?php
$defaultConfig = (new ConfigVariables())->getDefaults();
$fontDirs = $defaultConfig['fontDir'];
$defaultFontConfig = (new FontVariables())->getDefaults();
$fontData = $defaultFontConfig['fontdata'];
//当文件不存在，再生成
// if (!is_file($localFileUrl)) {
$mpdf = new Mpdf([
// 'mode' => 'utf-8',
'mode' => '-aCJK',
'format' => 'A4',
'useSubstitutions' => true,
'useAdobeCJK' => true,
'autoScriptToLang' => true,
'autoLangToFont' => true,
'mgl' => 15,
'mgr' => 15,
'mgt' => 16,
'mgb' => 16,
'mgh' => 9,
'mgf' => 9,
'orientation' => 'P',
'fontDir' => array_merge($fontDirs, [
Yii::$app->basePath . '/fontData',
]),
'fontdata' => ArrayHelper::merge($fontData, [
//配置全局字体
'gb' => [
'R' => 'gb.ttf',
'sip-ext' => 'gb',
],
'default_font' => 'gb'
])
]);
// $mpdf->SetFont('gb');
$mpdf->ignore_invalid_utf8 = true;
$mpdf->useAdobeCJK = true;
$mpdf->autoLangToFont = true;
$mpdf->autoScriptToLang = true;
$mpdf->SetDisplayMode('fullpage'); // 设置pdf显示方式
$mpdf->pgwidth = '240mm'; // 设置pdf的尺寸为mm*mm
$authPic = Yii::$app->basePath . '/rundata/auth/auth_1.png';
$mpdf->WriteHTML("<img src='{$authPic}'>");
$mpdf->WriteText(74, 95, '中文中文');