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PHP Programing language

How Can Using Nesting Function
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<html>
<head>
<title>	Nesting Function</title>
</head>
<body>
<?php

function myFunction($p,$t) 
{
   function convert_pound($d, $c=1.9) 
   {
      return $d * $c;
   }
   $total = $p + ($p * $t);  
   echo "Total cost in d: $total. Cost in 
   British pounds: " . convert_pound($total);
}

myFunction(18.00,.090);
echo convert_pound(18);
?> 
</body>
</html>

Output:

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