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mysqli declares in php_mysqli_structs.h structures which internally are used. One of these is MY_MYSQL. However, if another extension wants to make use of a mysqli object it has no chance to decode it, because php_mysqli_structs.h is not installed.
Split php_mysqli_structs.h in two header files : one really public and one private. Install the public one.
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Automatic comment from SVN on behalf of andrey
Log: Fix for bug #52654 mysqli doesn't install headers with structures it uses
Fix will appear with 5.3.4