Description:
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In the php.ini files included in the download the extensions directly is set as: extension_dir = "./"

This prevents php from working.  It took me four hours of searching until I tripped over documentation about extension_dir.  Once I chenged the line to read: extension_dir = "c:/php/ext"  the problem was fixed.

Nowhere was it stated as part of the installation procedure to change this line.

Reproduce code:
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extension_dir = "./"

Expected result:
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php preprocessing does not occur

Actual result:
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php preprocessing does not occur