Документация PHP
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Stream Errors
As with any file or socket related function, an operation 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 occurs an E_WARNING message will be generated describing the nature of the error.