Is there a PHP function for swapping the values of two variables?

Question

Say for instance I have ...

$var1 = \"ABC\"
$var2 = 123

and under certain conditions I want to sw

Answer 1

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

Answer 2

list($var1,$var2) = array($var2,$var1);

Answer 3

This one is faster and needs lesser memory.

function swap(&$a, &$b) {
    $a = $a ^ $b;
    $b = $a ^ $b;
    $a = $a ^ $b;
}

$a = "One - 1";
$b = "Two - 2";

echo $a . $b; // One - 1Two - 2

swap($a, $b);

echo $a . $b; // Two - 2One - 1

Working example: http://codepad.viper-7.com/ytAIR4

Answer 4

another answer

$a = $a*$b;
$b = $a/$b;
$a = $a/$b;

Answer 5

Yes, there now exists something like that. It's not a function but a language construct (available since PHP 7.1). It allows this short syntax:

 [$a, $b] = [$b, $a];

See "Square bracket syntax for array destructuring assignment" for more details.

Answer 6

Here is another way without using a temp or a third variable.

<?php
$a = "One - 1";
$b = "Two - 2";

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

echo $a . $b;
?>

And if you want to make it a function:

    <?php
    function swapValues(&$a, &$b) {
         list($b, $a) = array($a, $b);
     }
    $a = 10;
    $b = 20;
    swapValues($a, $b);

    echo $a;
    echo '<br>';
    echo $b;
    ?>