Take a look at the four methods in PHP to exchange two integer variables

Let’s see what four methods PHP has to exchange two integer variables?

Exchange two integer variables

• Use an intermediate variable

This is the easiest to understand

$a = 1;
$b = 2;
$temp = $a;
$a = $b;
$b = $temp;
var_dump($a, $b);

• Do not use intermediate variables, just rely on several additions and subtractions to cleverly convert

$a = 10;
$b = 5;
$a = $a + $b;
$b = $a - $b;
$a = $a - $b;
var_dump($a, $b);

• Use multiple XORs in bit operations

$a = 1;
$b = 3;
$a = $a ^ $b;
$b = $a ^ $b;
$a = $a ^ $b;
var_dump($a, $b);

• Use list structure

$a = 4; $b = 5;
list($b, $a) = [$a, $b];//等同于 [$b, $a] = [$a, $b];
var_dump($a , $b);

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