Description:
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If session.bug_compat_42 is 1, and I execute the code in a web page, loading the page causes a segmentation fault.

Changing session.bug_compat_42 to 0, allows the page to load without problems.

PHP version: 5.0.4
OS version:  SLES 9 i686


Reproduce code:
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$page = basename($_SERVER['PHP_SELF']);


Expected result:
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$page would contain the webpage base name, e.g. '/webpage.php'.

Actual result:
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empty page