Asking for advice on how to write a JS PHP (Xiaobai and Wang Haihan)

I want to get the content of a JS but don’t know how to write it. Could you please help me write it down? Thank you! The JS template is as follows {"types":[{"name":"A(IOS)","channels":[{"id":011,"name":"ABC","pa":"http:// Domain name/ios/-sedadfa---0012/ac.txt","img":"http://domain name/sk/Icon/1805812046.png"},{"id":22... I want to get one I don’t know how to write the content of JS. Could you please help me write it down? Thank you!
JS template is as follows
{"types":[{"name":"A(IOS)","channels":[{"id":011,"name":"ABC","pa" :"http://domain name/ios/-sedadfa---0012/ac.txt","img":"http://domain name/sk/Icon/1805812046.png"},{"id":221, "name":"A-LKN","pa":"http://domain name/ios/HAdrsa---0032/ac.txt","img":"http://domain name/sk/Icon/190567826 .png"},{"id":173,"name":

My purpose is to get the "http://domain name/ios/HAdrsa---0032/" after 221 through php?id=221 ac.txt"When the id=011 is obtained, it is "http://domain name/ios/-sedadfa---0012/ac.txt"
I am a noob who doesn’t understand PHP at all, so I just hope my friends can help me if I need it! Thanks!