Re: How can I replace $_SERVER["DOCUMENT_ROOT"] in PHP 7.0?

> Does it matter if I use
> $_SERVER["DOCUMENT_ROOT"] rather than
> $_SERVER['DOCUMENT_ROOT']
>
> In the code I am struggling with it uses double quotes rather than single quotes
> as you show here,

No. There's no practical difference between single and double quotes here.

The only difference between single and double quotes is that double 
quotes allow the use of variables and escape sequences (single quoted 
strings only parse the \\ and \' escape sequences)

See: https://www.php.net/manual/en/language.types.string.php