What are the best practices for defining the size of a small window when using JavaScript in PHP?

When defining the size of a small window using JavaScript in PHP, it is important to ensure that the window dimensions are specified accurately to provide a good user experience. To do this, you can use the window.open() method in JavaScript to create a new browser window with specific width and height parameters. It is recommended to calculate the window size dynamically based on the user's screen resolution or content requirements to ensure compatibility across different devices.

<?php
echo '<script type="text/javascript">
        var width = 500; // specify the width of the window
        var height = 400; // specify the height of the window
        var left = (screen.width - width) / 2; // calculate the left position
        var top = (screen.height - height) / 2; // calculate the top position
        window.open("https://www.example.com", "", "width=" + width + ", height=" + height + ", left=" + left + ", top=" + top");
      </script>';
?>