Where do we download the software used for php?

Answer 1

Chidera Melvin use the links below:
XAMPP -->
https://www.apachefriends.org/download.html
WampServer -->
https://download.cnet.com/WampServer-64-Bit/3000-10248_4-75544590.html
Sublime text -->
https://filehippo.com/download_sublime_text

Answer 2

you can use any of the below listed IDE:

1-Eclipse
2-netbean
3-PHPStorm
4-NUsphere
5-Zend studio
6- Sublime text
7-Komodo

and many more just try any of the above one and see what suits you better :)