Get variables from the outside, inside a function in PHP

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You’ll need to use the global keyword inside your function.
http://php.net/manual/en/language.variables.scope.php

EDIT (embarrassed I overlooked this, thanks to the commenters)

…and store the result somewhere

$var="1";
function() {
    global $var;
    $var += 1;   //are you sure you want to both change the value of $var
    return $var; //and return the value?
}

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