Description:
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This problem is same as copy() function

Reproduce code:
---------------
<?php
$des5 = fopen("1.txt", "r"); //"hello" in 1.txt
$des6 = fopen("1.txt", "w");
stream_copy_to_stream($des5, $des6);
readfile("1.txt");

?>


Expected result:
----------------
hello

Actual result:
--------------
none