PHP swap

1 개요

PHP swap

$a = 3; $b = 5;
list($a,$b) = [$b,$a];
echo "a=$a, b=$b";

function swap(&$a, &$b) {
	list($a,$b) = [$b,$a];
}
$a = 3;
$b = 5;
swap($a, $b);
echo "a=$a, b=$b";

swap with temp

function swap(&$a, &$b) {
	$temp = $b;
	$b = $a;
	$a = $temp;
}
$a = 3; $b = 5;
swap($a, $b);
echo "a=$a, b=$b";

xor swap

$a = 3; $b = 5;
$a ^= $b ^= $a ^= $b;
echo "a=$a, b=$b";

function xor_swap(&$a, &$b) {
    $a = $a ^ $b;
    $b = $a ^ $b;
    $a = $a ^ $b;
}
$a = 3; $b = 5;
xor_swap($a, $b);
echo "a=$a, b=$b";

2 같이 보기

• PHP list()
• 함수 swap()