$a = 5; // Pass by Value function pass_by_value($a) { $a = 10; return $a; } echo 'Function Processed :: ', pass_by_value($a), ' Original :: ', $a ,'
'; // Pass by Reference function pass_by_reference(&$a) { $a = 10; return $a; } echo 'Function Processed :: ', pass_by_reference($a), ' Original :: ', $a ,'
';