Switching two variables with PHP

Published on 2026-01-04 • Modified on 2026-01-04

This snippet shows how to switc two variables with PHP.

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<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

/**
 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
 */
trait Snippet338Trait
{
    public function snippet338(): void
    {
        $a = 555;
        $b = 10001;
        var_dump('a,b:', $a, $b);
        [$a,$b] = [$b, $a];
        echo PHP_EOL;
        var_dump('a,b (after switch):', $a, $b);

        // That's it! 😁
    }
}

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