Wednesday 15th August 2007
by Sajith M.R
PHP Simple Swap >>
Hello programmers,
You know list function in php and array function. Just
type like below for swapping two variables $a and $b.
| list($b,$a) = array($a,$b); |
The above code is equivalent to:
$temp = $a;
$a = $b ;
$b= $temp;
Here we shorten the three line of code into a single line.
Yes good , but it won’t work for all types of object swapping, say an array swap . Only for integers
$a ^= $b ^= $a ^= $b
miah the xor trick only properly works on integers OR if string happen to be the same length, it will work, it’s best to avoid that trick unless you really need it.
$a = “a”;
$b = “gggggg”;
$a = $a ^ $b;
echo “$b “;
$b = $a ^ $b;
echo “$b “;
$a = $a ^ $b;
echo “$a $b “;
// $a = ‘g’; $b = ‘a’;
Nice trick, thanks
miah, I like your trcik too
Thanks guys !
Tiger
$a = ‘bar’;
$b = ‘foo’;
$a = $a ^ $b;
$b = $a ^ $b;
$a = $a ^ $b;
echo $a . $b;
// its faster and needs less memory ^^
Good idea
AFIK, this construction needs more memory.