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Programming PHP, 3rd Edition by Peter MacIntyre, Kevin Tatroe, Rasmus Lerdorf

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Name

interface_exists

Synopsis

bool interface_exists(stringname [, bool autoload_interface])

Returns true if an interface named name has been defined and false otherwise. By default, the function will call __autoload() on the interface; if autoload_interface is set and is false, __autoload() will not be called.

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