Questions about php Basics

Php basic question a (aa)-& gt; B (bb)-& gt; c (cc); what does this mean? It is not too troublesome. can you give an example to illustrate it? I don't know much about this. here is more about basic php questions.
A ('A')-> B ('BB ')-> c ('CC ');
What does this mean?
It is not too troublesome. can you give an example to illustrate it?
Not familiar with this

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------ Solution --------------------
Obtain an object in function a, and then call Method B of this object. Method B returns an object, and then calls its c method through this object.
------ Solution --------------------

a()->b()->c();
function a() {
$r = new obj1;
return $r;
}
class obj1{
public function b(){
$r=new obj2;return $r
}
}
class obj2{
public function c(){
//do something
}
}

------ Solution --------------------

class T {
  function b($v) {
    echo $v;
    return $this;
  }
  function c($v) {
    echo $v;
    return $this;
  }
}
function a($v) {
  echo $v;
  return new T;
}

a('aa')->b('bb')->c('cc');

------ Solution --------------------
Reference:

A ('A')-> B ('BB ')-> c ('CC ');
What does this mean?
It is not too troublesome. can you give an example to illustrate it?
Not familiar with this

A () independent method returns an object of an instantiated class. this class contains function B. function B returns the object of another class and contains function c.