配列に入れたオブジェクトをソートする（PHP5）

test.php

<?php

class Shop
{
    var $kana;
    var $shopName;
    var $tel;

    function __construct($kana, $shopName, $tel)
    {
        $this->kana = $kana;
        $this->shopName = $shopName;
        $this->tel = $tel;
    }
}

function cmp($a, $b)
{
    $cmp = strcmp($a->kana, $b->kana);
    return $cmp;
}

// オブジェクトを配列に入れる
$shopList[] = new Shop("やまだとけいてん", "山田時計店", "03-6234-5678");
$shopList[] = new Shop("かとうふとんてん", "加藤ふとん店", "03-4234-5678");
$shopList[] = new Shop("うおとく", "魚徳", "03-3234-5678");
$shopList[] = new Shop("やまだとうふてん", "山田豆腐店", "03-5234-5678");
$shopList[] = new Shop("いのうえせいにくてん", "井上精肉店", "03-2234-5678");
$shopList[] = new Shop("あんどうせいかてん", "安藤青果店", "03-1234-5678");

// 配列をソート
usort($shopList , "cmp");

// 確認
print_r($shopList);

/*
結果

Array
(
    [0] => Shop Object
        (
            [kana] => あんどうせいかてん
            [shopName] => 安藤青果店
            [tel] => 03-1234-5678
        )

    [1] => Shop Object
        (
            [kana] => いのうえせいにくてん
            [shopName] => 井上精肉店
            [tel] => 03-2234-5678
        )

    [2] => Shop Object
        (
            [kana] => うおとく
            [shopName] => 魚徳
            [tel] => 03-3234-5678
        )

    [3] => Shop Object
        (
            [kana] => かとうふとんてん
            [shopName] => 加藤ふとん店
            [tel] => 03-4234-5678
        )

    [4] => Shop Object
        (
            [kana] => やまだとうふてん
            [shopName] => 山田豆腐店
            [tel] => 03-5234-5678
        )

    [5] => Shop Object
        (
            [kana] => やまだとけいてん
            [shopName] => 山田時計店
            [tel] => 03-6234-5678
        )

)
*/

?>