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flag indicating if the wrapper is responsible for raising errors using trigger_error() during opening of the stream.
as with any file or socket related function, an opperation on a stream may fail for a variety of normal reasons (i.e.: unable to connect to remote host, file not found, etc...). a stream related call may also fail because the desired stream is not registered on the running system. see the array returned by stream_get_wrappers() for a list of streams supported by your installation of php. as with most php internal functions if a failure occours an e_warning message will be generated describing the nature of the error.