enum.php

<?php

namespace Bim\Bam\BingoEnum;

use Symfony\Component\Validator\Exception\InvalidArgumentException;

abstract class BeerErrorCode
{
    const BARRELEMPTY    = 4;
    const SERVICESTOP    = 8;
    const YOURDRUNK      = 15;
    const SHITTYBEER     = 16;
    const PAYFIRST       = 23;
    const NOTENOUGHMONEY = 42;

    protected static $errorNames = array(
        self::BARRELEMPTY    => 'Oh no! Barrel is empty!',
        self::SERVICESTOP    => 'It\'s over guys. See you tomorrow :)',
        self::YOURDRUNK      => 'You\'re drunk. Go Home!',
        self::SHITTYBEER     => 'We don\'t serve Kronembourg.',
        self::PAYFIRST       => 'You need to pay first!',
        self::NOTENOUGHMONEY => 'Not a charitable organization'
    );

    /**
     * Return error name
     * @param  int     $errorCode  Error's code
     * @return string              Error's name
     */
    public static function getErrorName($errorCode)
    {
        if (!isset(static::$errorNames[$errorCode])) {
            return "Unknown error (code: $errorCode)";
        }

        return static::$errorNames[$errorCode];
    }
}

//--------------------------------------------
// Using:
echo BeerErrorCode::BARRELEMPTY;  
// 4
echo BeerErrorCode::getErrorName(BeerErrorCode::BARRELEMPTY); 
// Oh no! Barrel is empty!