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# com_load_typelib

(PHP 4 >= 4.1.0, PHP 5)

com_load_typelib -- Loads a Typelib

## Description

bool com_load_typelib ( string typelib_name [, bool case_insensitive] )

Loads a type-library and registers its constants in the engine, as though they were defined using define(). The `case_insensitive` behaves in the same way as the parameter with the same name in the define() function.

`typelib_name` can be one of the following:

- The filename of a `.tlb` file or the executable module that contains the type library.

- The type library GUID, followed by its version number, for example `{00000200-0000-0010-8000-00AA006D2EA4},2,0`.

- The type library name, e.g. `Microsoft OLE DB ActiveX Data Objects 1.0 Library`.

PHP will attempt to resolve the type library in this order, as the process gets more and more expensive as you progress down the list; searching for the type library by name is handled by physically enumerating the registry until we find a match.

Note that it is much more efficient to use the `com.typelib_file` configuration setting to pre-load and register the constants, although not so flexible.

If you have turned on `com.autoregister_typelib` , then PHP will attempt to automatically register the constants associated with a COM object when you instantiate it. This depends on the interfaces provided by the COM object itself, and may not always be possible.

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