PHP Code:
list($a, $b) = array($b, $a);
Edit:
Originally Posted by Village Genius 
PHP Code:
<?
$a = 'Raphael';
$b = 'Castiel';
echo "start $a $b <br />";
$a .= $b;
$b=substr($a,0,(strlen($a)-strlen($b)));
$a=substr($a,strlen($b));
echo "end $a $b <br />";
?>
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In case anyone is interested, it occurred to me today that this is more or less an
XOR swap.