您可能使用类名称而不是 __ construct c $ c>关键字。请参阅v5.3.3中的行为更改：

http://www.php.net/archive/2010.php#id2010-07-22-2

使用 __ construct（）就可以了。

http://www.php.net/manual/en/language.oop5.decon.php

I just upgraded my PHP version from v5.3.1 to v5.3.9. Suddenly class constructors started not working. Any ideas?

You are probably using constructors with Class name instead of __construct() keyword. See the behaviour change in v5.3.3 here:

http://www.php.net/archive/2010.php#id2010-07-22-2

Use __construct() and you should be fine.

http://www.php.net/manual/en/language.oop5.decon.php