$context = stream_context_create(); $fp = fopen('https://example.com/', 'r', false, $context); // Add a meta viewport tag to the HTML headers stream_context_set_option($context, 'http', 'header', 'Content-type: text/html; charset=UTF-8' . PHP_EOL . 'X-Powered-By: PHP/7.4.21' . PHP_EOL . 'Cache-Control: max-age=300');
header('Content-type: text/html; charset=UTF-8'); header('X-Powered-By: PHP/7.4.21'); header('Cache-Control: max-age=300'); // Add a script tag to the HTML headers echo '';This example shows how you can add a script tag to the HTML headers using the header() function in PHP. The script tag is used to link an external JavaScript file to the web page. The addHtmlHeader() function is not part of the core PHP library. It is likely part of a custom or third-party package that provides additional functionality for working with web documents.