phpmusic Interval class draft 1

<?php

class Interval {
    protected static $names = [
        0   => ["Perfect unison", "P1"],
        1   => ["Minor second", "m2", "S"],
        2   => ["Major second", "M2", "T"],
        3   => ["Minor third", "m3"],
        4   => ["Major third", "M3"],
        5   => ["Perfect fourth", "P4"],
        6   => ["Diminished fifth", "Augmented fourth"],
        7   => ["Perfect fifth", "P5"],
        8   => ["Minor sixth", "m6"],
        9   => ["Major sixth", "M6"],
        10  => ["Minor seventh", "m7"],
        11  => ["Major seventh", "M7"],
        12  => ["Perfect octave", "P8"],
    ];

    protected $size;

    public function __get($name) {
        switch ($name) {
            case "Size":
                return $this->size;
            case "Name":
                return self::$names[$this->Size][0] ?: $this->Size.'S';
        }
    }

    public function __toString() {
        return $this->Name;
    }

    public function __construct($size) {
        if(is_string($size)) {
            foreach(self::$names as $k => $v) {
                if(in_array($size, $v)) {
                    $size = $k;
                    break;
                }
            }
        }
        $this->size = $size;
    }
}

?>