如何从前一个范围获取所有声明的变量？

Question

// SCOPE 1
printsmth();    

function printsmth(){
  // SCOPE 2 (printsmth)

  // here (inside SCOPE 2) get variables visible in SCOPE 1
  // var_dump($vars);
}

Can I do this?

Essentially I want to get all declared variables from where my function was called, but inside the function (and ignore variables declared in my function)

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something like getting the result of get_defined_vars();, within my function, but for the previous scope :)

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ok even more clearly - I just want my own clone of the `get_defined_vars` function. When I call my function it should display a list of declared variables in the current scope.

Answer 1

Use global keyword:

$variable = true;

function printsmth(){
  global $variable;

  if ( $variable ) {
    echo 'it works';
  }
}

printsmth();