Prerequisites
The following is list of prerequisites and assumptions needed for writing a PDO database driver:
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A working target database, examples, demos, etc. working as per vendor specifications;
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A working development environment:
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Linux: standard development tools, gcc, ld, make, autoconf, automake, etc., versions dependent on distribution;
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Other Unix: standard development tools supplied by vendor plus the GNU development tool set;
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Win32: Visual Studio compiler suite;
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A working PHP environment version 5.0.3 or higher with a working PEAR extension version 1.3.5 or higher;
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A working PDO environment (can be installed using 'sudo pecl install PDO'), including the headers which will be needed to access the PDO type definitions and function declarations;
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A good working knowledge of the C programming language;
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A good working knowledge of the way to write a PHP extension; George Schlossnagle's Advanced PHP Programming (published by Developer's Library, chapters 21 and 22) is recommended;
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Finally, a familiarity with the Zend API that forms the heart of PHP, in particular paying attention to the memory management aspects.
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