PHP: Making array by decoding a encoded string

I’m sorry for bad title for this question.

what’s type of this code and it’s name?:

a:2:{i:1;a:4:{s:5:"index";s:1:"1";s:4:"name";s:22:"برای تست اول";s:6:"amount";s:6:"600000";s:11:"description";s:31:"فقط برای یک دامنه";}i:2;a:4:{s:5:"index";s:0:"";s:4:"name";s:22:"برای تست دوم";s:6:"amount";s:5:"70000";s:11:"description";s:37:"مجوز برای 2 تا 3 دامنه";}}

and How can I make an array by above code in php?

PHP: Making array by decoding a encoded string