PHP Thread Safe and Non-Thread Safe for Windows

Question

I am downloading PHP for Windows. I got 2 options on the website.

1. PHP Thread Safe
2. PHP Non-Thread Safe

Please answer the following questions

Answer 1

Quick and simple: If you are using Apache edit your Apache24\conf\httpd.conf file and search for "loadmodule". If you see your loadmodule is referencing a .dll something like:

LoadModule php7_module "e:/x64Stack/PHP/php7.1.9/php7apache2_4.dll"
AddHandler application/x-httpd-php .php
PHPIniDir "e:/x64Stack/PHP/php7.1.9"

Then you want Thread Safety enabled or TS - Thread Safe version.

Else if you are using IIS or Apache with CGI then NTS flavor.

I use multiple stacks and within those multiple servers and versions of PHP so don't let the paths / php or server versions throw you.