php中如何使用引用

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一想到时光匆匆，竟经不起半点挥霍，我就会对时间吝啬起来，因为此刻已过，便永不复还。

实例一

使用foreach修改数组

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protected static function packedData($data, $key, $type = 'delete')
    {
        // 删除data中的必要数据
        if ($type == 'update') {
            foreach ($data as &$order) {
                unset($order['useragent']);
                unset($order['ad_id']);
                unset($order['ad_channel']);
                unset($order['ad_url']);
                unset($order['ad_referer']);
                unset($order['ad_referer_host']);
                unset($order['ad_url_param']);
                unset($order['utm_source']);
                unset($order['utm_medium']);
                unset($order['utm_term']);
                unset($order['utm_content']);
                unset($order['utm_campaign']);
            }
        }
        return [
            'key' => $key,
            'data' => $data
        ];
    }

实例二

在没有返回值的情况下修改数组中的值

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Route::get('hehe', function () {
    $datas = [1,2,3,4];
    haha($datas);
    dump($datas);
});

function haha(&$datas)
{
    foreach ($datas as $data) {
        $data = $data * 2;
    }
    return $datas;
}