Swap.php

Swap.php

<?php
/**
 * Swap two variables' values without extra variable.
 */
# Solution 1:
function solution1 ($a, $b)
{
    $a = $a + $b - ($b = $a);
    echo "solution1 :", PHP_EOL;
    var_dump($a, $b);
}
# Solution 2:
function solution2 ($a, $b)
{
    $a = $a + $b;
    $b = $a - $b;
    $a = $a - $b;
    echo "solution2 :", PHP_EOL;
    var_dump($a, $b);
}
# Solution 3:
function solution3 ($a, $b)
{
    $a = $a * $b;
    $b = $a / $b;
    $a = $a / $b;
    echo "solution3 :", PHP_EOL;
    var_dump($a, $b);
}
$a = 1;
$b = 2;
echo 'Input :', PHP_EOL;
var_dump($a, $b);
echo '============', PHP_EOL;
solution1($a, $b);
solution2($a, $b);
solution3($a, $b);
# end of this file.