Description:
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From manual page: http://www.php.net/phar.construct#Description
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if You require a phar file eg. Your Demo Example myphar.phar, the Include Path is extended by phar://myphar.phar . The path separator in a include path is Colon ":" and is also contained in "phar://myphar.phar". How are recognized the
correct include files, especially if You have required more then one phar file.

Test script:
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Your Demo Example myphar.phar additionally with: echo get_include_path ();

Actual result:
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phar://myphar.phar:.:/php/includes