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このドキュメントでは、 php中国語ネットマニュアル リリース
(PHP 4 >= 4.3.2, PHP 5)
streamWrapper::__construct — Constructs a new stream wrapper
Called when opening the stream wrapper, right before streamWrapper::stream_open() .
此函数没有参数。
[#1] Anonymous [2013-07-12 18:50:18]
Note, https://bugs.php.net/bug.php?id=40459 shows that __construct() not being called in all cases was a bug, and it was fixed in August 2012.
[#2] codeslinger at compsalot dot com [2009-11-20 10:27:10]
Just to clarify what was said above, as far as I can tell, __construct is *only* called before stream_open.
It does not get called for other functions such as stream::url_stat or stream::unlink, even though those functions do create a new object.
This behavior is contrary to normal expectations for php object creation. But based on the documentation above I can only assume that it is by design.