Description:
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The message claims success, although it is a warning and the file fails to open. 

Test script:
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<?php

$f = fopen('existing.file', 'Q');


Expected result:
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PHP Warning:  fopen(existing.file): failed to open stream: Mode "Q" is not valid in /home/robert/test.php on line 3

Actual result:
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PHP Warning:  fopen(existing.file): failed to open stream: Success in /home/robert/test.php on line 3