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Sterling Hughes is a freelance Web developer, creating dynamic Web applications in PHP, C, and Perl for Fortune 500 companies. He is one of the authors of the PHP documentation and he has written articles on PHP for Web Reference, Zend.com, and Web Techniques. Andrei Zmievski is the lead development engineer and open source researcher at ispi, where he works on e-commerce and Web publishing projects. He is a member of the PHP core development group and has contributed to several other open source projects.