php file_get_contents 读取大文件出错
Note: string can be as large as 2GB.
file_get_contents如果正常返回，会把文件内容储存到某个字符串中，所以它不应该返回超过2G长度的字符串。
如果文件内容超过2G，不加offset和maxlen调用file_get_contents的话，肯定会返回false，
在64位机上面啥错都不报啊，我晕:
PHP 5.4.16 (cli) (built: Jun 7 2013 14:32:19)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
with XCache v3.0.2, Copyright (c) 2005-2013, by mOo
with XCache Optimizer v3.0.2, Copyright (c) 2005-2013, by mOo
with XCache Cacher v3.0.2, Copyright (c) 2005-2013, by mOo
with XCache Coverager v3.0.2, Copyright (c) 2005-2013, by mOo
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回到32位机，报这样的错：
PHP 5.3.10 (cli) (built: Jul 7 2012 12:30:39)
Copyright …