Is it possible to control browser settings, such as print scaling, through PHP or JavaScript?

It is not possible to directly control browser settings such as print scaling through PHP or JavaScript as these settings are controlled by the user's browser preferences. However, you can suggest print settings to the user through CSS media queries for printing. By specifying print-specific styles in your CSS, you can influence how the content will be displayed when printed. 

<style type="text/css" media="print">
    @page {
        size: A4; /* Set the paper size */
        margin: 1cm; /* Set the margin */
    }
</style>

Keywords

PHP JavaScript browser settings print scaling control

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