Program to swap two numbers without using a third variable.

$x = 2;
$y = 3;
echo "X = ".$x;
echo "Y =".$y;

$x = $x + $y;
$y = $x - $y;
$x = $x - $y;

echo "X = ".$x;
echo "Y =".$y;

//OutPut : 
X = 3
Y = 2

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