I found different code examples like this, which use the file handle STDERR just like this:

fwrite(STDERR, "hello\n");

Also, the PHP documentation of input/output streams (http://php.net/manual/de/wrappers.php.php) says:

"It is recommended that you simply use the constants STDIN, STDOUT and STDERR instead of manually opening streams using these wrappers."

I don't want to use the "php://stderr" wrapper, because this just creates a duplicate of the original STDERR handler and if I'm closing "php://stderr", the original STDERR still would exist.

When I'm using this code, I only get:

<b>Notice</b>: Use of undefined constant STDERR - assumed 'STDERR' in <b>/test.php</b> on line <b>4</b><br />
<br />
<b>Warning</b>: fwrite(): supplied argument is not a valid stream resource in <b>/test.php</b> on line <b>4</b><br />

How can I access the original STDERR handle? The constant should be there, but does not exist.


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