View file vendor/visavi/captcha/src/PhraseBuilder.php

<?php

declare(strict_types=1);

namespace Visavi\Captcha;

class PhraseBuilder
{
    /**
     * Get random phrase of given length with given charset
     *
     * @param int        $length
     * @param int|string $characters
     *
     * @return string
     */
    public function getPhrase(
        int $length = 6,
        int|string $characters = 'abcdefghijklmnpqrstuvwxyz123456789'
    ): string {
        $phrase = '';
        $characters = (string) $characters;
        $charactersLength = strlen($characters);

        for ($i = 0; $i < $length; $i++) {
            $phrase .= $characters[rand(0, $charactersLength - 1)];
        }

        return $phrase;
    }
}