Accessing a variable defined in a parent function

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PHP<5.3 does not support closures, so you’d have to either pass $foo to inner() or make $foo global from within both outer() and inner() (BAD).

In PHP 5.3, you can do 

function outer()
{
  $foo = "...";
  $inner = function() use ($foo)
  {
    print $foo;
  };
  $inner();
}
outer();
outer();

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