MDL-32471 fixing the coding style in lib/gdlib.php
MDL-32471 fixing the coding style in lib/gdlib.php

The GD functions are listed in lowercase in the PHP manual. So they
should be using this case in our code, too (otherwise, doc autolinking
tools may not work). I did not remove the underscore from the parameters
names intentionally to have the function interface compatible with the
one documented in the PHP manual.

See http://www.php.net/manual/en/ref.image.php
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dilawar/moodle