Is it possible to pass a value to the parameter of a function in PHP? -

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there function returns value : 

function f($criteria, $extra_return) {    return $criteria['activity_code']; }

i want set value $extra_return parameter. possible in php ?

yes, use passing reference.

function f($criteria, &$extra_return) {    $extra_return = 1;    return $criteria['activity_code']; }

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