Description:
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From manual page: http://www.php.net/phar.extractto#refsect1-phar.extractto-
description
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I don't see any particular reason for that requirement phar.readonly. I tried 
using this method with phar.readonly set to both 1 and 0 and in both cases it 
works perfectly.

As for functionality, when using this method original phar file is not affected 
and modified in any way, and for that reason phar.readonly shoud not be relevant.

Also on the same page, on method params section block. Description of the first 
metod parameter is 'Path within an archive to the file to delete.' which is also 
mistake. First parameter is destination directory, and extracing phar file to 
directory has nothing to do with deleting files.

This leads me to conclusion that this is some mistake in documentation. However i 
must be sure before heavily relay on this method in our application.

Thank you