PHP can be obtained using debug_backtrace .

javascript：

class Foo {
    a() {
        console.log('call func b');
        this.b();
    }
    b() {
        console.log(this.a.name);
    }
}

1:
class Foo {

function a(){
    var name = '';
    b(name);
}
function b(var name){
    console.log(name);
}

}