Can i search a word in a certain project

Hi, Can i ask some help how do i search a certain word in my project?, ...for example i have a lots of php files folders and inside my folder a lots of php,css files or js file, now what i want is how do i search  a certain word that i am looking? let says "mycontent" and i want to know where does this "mycontent" word located in a certain file...



Thank you in advance :)