Php To Swap Values using call by value (function).

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Create Form For Entering Two Numbers

(swap.html)

<!DOCTYPE html>
<html>
<form method="POST" action="swap.php">
Enter first number:<input type="text" name="n1">
Enter second number:<input type="text" name="n2">
<input type="submit">
</form>
</html>




Embed Php File Into Form Tag
 
(swap.php)

<?php
$a=$_POST["n1"];
$b=$_POST["n2"];
 function swap($x,$y) {
   $t=$x;
   $x=$y;
   $y=$t;
   echo $x,"\n";
   echo $y;
}
swap($a,$b);
?>



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