Exchange variables _php tutorial for exchanging two variable values without a new variable

Swap the values of two variables without a new variable, swapping variables

Interview often encountered this problem, specifically studied the next, title

$a = 1;

$b = 2;

Method 1:

$a ^= $b, $b ^= $a; $a ^= $b;

Method 2:

List ($a, $b) =array ($b, $a);

Method 3: (If the variable is an integral type)

$a = $a + $b; $b = $a-$b; $a = $a-$b;

http://www.bkjia.com/PHPjc/972511.html www.bkjia.com true http://www.bkjia.com/PHPjc/972511.html techarticle Exchange variables without the value of the new variable exchange two variables often encountered this problem, specifically studied the next, title $a = 1; $b = 2; Method 1: $a ^= $b; $b ^= $a; $a ^= $b;

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