I wanna print out script's codes after the output.

The script goes on different ways on the way it calls. So i wanna see it when script runs. is there any function that prints all script codes as the way it writed.

Example: $foo = "bar"; $foo .= " is my bar"; function foobar() { // do some stuff here }

i wanna see the codes just like this. is there a way to do this? without file_get_contents(), file(), readfile() functions?