Generating float numbers with the Randomizer PHP class

Published on 2024-10-05 • Modified on 2024-10-05

This snippet shows how to generate float numbers with the Randomizer PHP class. The $min and $max boundaries can be inclusive or not, thanks to the third parameter of the getFloat() function, which accepts a value from the \Random\IntervalBoundary enumeration.


<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

use Random\IntervalBoundary;
use Random\Randomizer;

/**
 * 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 Snippet322Trait
{
    public function snippet322(): void
    {
        $rnd = new Randomizer();
        $float1 = $rnd->nextFloat();
        $float2 = $rnd->getFloat(0.5, 5.5);
        $float3 = $rnd->getFloat(0.1, 0.2, IntervalBoundary::ClosedClosed); // 0.1 and 0.2 are excluded

        echo '[0.0, 1.0): '.$float1.' ('.\strlen((string) $float1).')'.PHP_EOL; // Outputs a float in [0.0, 1.0)
        echo '[0.5, 5.5): '.$float2.' ('.\strlen((string) $float2).')'.PHP_EOL; // Outputs a float in [0.5, 2.5)
        echo '(0.1, 0.2): '.$float3.' ('.\strlen((string) $float3).')';         // Outputs a float in (0.1, 0.2)

        // That's it! 😁
    }
}

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