Question

This question is closely related to my new findings, regarding this question.

Is there any way to preserve the in stream data of php://memory or php://temp between handles? I read (somewhere I can’t source off hand) that subsequent openings of the aforementioned streams clears existing data.

$mem1 = fopen('php://memory', 'r+');
fwrite($mem1, 'hello world');
rewind($mem1);
fpassthru($mem1); // "hello world"

$mem2 = fopen('php://memory', 'r+');
rewind($mem2);
fpassthru($mem2); // empty

So again my question is, is there anyway to force existing data to persist in stream when creating a new handle to it?

(The latter call to fpassthru() would of course dump hello world given this is possible)

Answer 1

Opening one of the pseudo-streams php://temp or php://memory always opens a new stream, what means, that every stream your open this way is unique. So you can’t read the content of the stream you have previously written to another one.