Cannot Bulk Rename php in VSCODE Edit

I use VSCODE to write the php code.
I'm going to rename a variable or function.

Many sites say "Press F2", but
When I actually press F2, there is no response.

The variable has a cursor and the variable is selected, all of which are unresponsive.

Click Ctrl-F2 to change the string.
It is not available because it ignores the scope and changes all characters.

function sample1(){
  $result=1;//<=Change this
  return$resutl;
}
function sample2(){
  $ResultSample=2;
  return$ResultSample;
}

/// If resetl is hoho, the following occurs:
function sample1(){
  $hogehoge=1;
  return $hogehoge;
}
function sample2(){
  $hogehogeSample=2;
  return $hogehogeSample;
}

By the way, when editing vue, you can change the name of the in-scope variable with the "f2 key when the variable has a cursor (not selected)."

There seems to be some configuration, but I couldn't find it in the search engine.
Is there anything that needs to be expanded?
Thank you for your cooperation.