沈二铺子

If you want to make the best use out of autoload with an APC cache don’t use spl_autoload. It uses relative paths and thus will perform a stat even with apc.stat=0 (either that, or it doesn’t work at all).

Instead make a custom function and use require/include with an absolute path (register it with spl_autoload_register).

Do NOT use *_once functions or a relative path. This will fail harder than spl_autoload.

Also avoid using file_exists and is_file. This will also perform a stat.

Why are stats bad? Because they access the file system. PHP does have a stat cache that helps, but it defeats the purpose of apc.stat = 0.

It’s also good to keep in mind that it’s good to keep your custom autoload function simple. This is my Loader class:

class Loader
{
    public static function registerAutoload()
    {
        return spl_autoload_register(array(__CLASS__, 'includeClass'));
    }

    public static function unregisterAutoload()
    {
        return spl_autoload_unregister(array(__CLASS__, 'includeClass'));
    }

    public static function includeClass($class)
    {
        require(PATH . '/' . strtr($class, '_\\', '//') . '.php');
    }
}

Also want to point out that APC does an optimization with require/include (not *_once) with relative paths if require/include is done in the global scope (and isn’t conditional). So it would be a good idea to explicitly include files you know you’re going to use on every request (but don’t use *_once). You could, for example, add a “registerProfiledAutoload” to the above class and keep track of what you’re including to help you determine what you could explicitly include (during development, not production). The key is try not to make heavy use out of autoload.

If you must use relative paths and don’t care about having to lower-case your file-names then spl_autoload works great.

php 5.4.0开始，针对那那些既没有设置date.timezone，也没有执行过date_default_timezone_set()函数的情况下执行date()函数，开始抛出warning。所以还是最好在php.ini或者fpm.conf中设置一下timezone吧
It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone.

最近在看同伴们的代码。发现if else的部分总是会出现一些意外的情况。
对于js/php这样的弱类型语言来说，代码书写虽然非常灵活，但实际上却充满陷阱，边缘条件下都非常容易出错。

比如整数0和字符串’0′:
对于javascript来说，0是false，而’0′是true。但是对于php来说，0是false，’0′也是false。

再蛋疼一点，字符串’00′，在php中，竟然变成true。