$a=2;
$b=1;
$a=$a+$b;
$b=$a-$b;
$a=$a-$b;
print "a=".$a." and b=".$b;
value of variable a is swapped with value of variable b, without using a third buffer variable.
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You can use [html][/html], [css][/css], [php][/php] and more to embed the code. Urls are automatically hyperlinked. Line breaks and paragraphs are automatically generated.