Convert numbers to Roman Numbers

RomanNumeralConverter.php

<?php

/**
 * Mohammed Attya
 * RomanNumeralConverter
 * MIT Licence
 * run using WAMP / XAMPP / LAMP / MAMP or just php RomanNumeralConverter.php in terminal
 * make sure to install php first
 */

class RomanNumeralConverter
{

    private static $lookup = [
        1000 => 'M',
        900  => 'CM',
        500  => 'D',
        400  => 'CM',
        100  => 'C',
        90   => 'XC',
        50   => 'L',
        40   => 'XL',
        10   => 'X',
        9    => 'IX',
        5    => 'V',
        4    => 'IV',
        1    => 'I'
    ];

    public function convert($number)
    {
        $solution = '';

        foreach (static::$lookup as $limit => $glyph) {
            while ($number >= $limit) {
                $solution .= $glyph;
                $number -= $limit;
            }
        }

        return $solution;
    }

}

$converter = new RomanNumeralConverter;


// it is simple
// to print a list of roman numbers and arabic numbers just edit the variable n
$n = 100 // to make a list of first 100 numbers
for ($i=1; $i <= $n; $i++) { 
    echo "{$converter->convert($i)} \t is \t {$i}\n";
}

// to convert specific number uncomment next line and edit the number
// echo "{$converter->convert(100)} \t is \t 100\n";
// uncomment is just remove the first //