1. Go to this page and download the library: Download mainaero/yii2-gtm-widget library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
html
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-<YOUR_ID><YOUR_ENVIRONMENT_QUERY_STRING>"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->
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Before you can download the PHP files, the dependencies should be resolved. This can take some minutes. Please be patient.