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(PECL eio >= 0.0.1dev)

eio_dup2Duplicate a file descriptor


resource eio_dup2 ( mixed $fd , mixed $fd2 [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]] )

eio_dup2() duplicates file descriptor.



Source stream, Socket resource, or numeric file descriptor


Target stream, Socket resource, or numeric file descriptor


The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, pri internally is set to EIO_PRI_DEFAULT.


callback function is called when the request is done. It should match the following prototype:

void callback(mixed $data, int $result[, resource $req]);

is custom data passed to the request.


request-specific result value; basically, the value returned by corresponding system call.


is optional request resource which can be used with functions like eio_get_last_error()


Arbitrary variable passed to callback.

Return Values

eio_dup2() returns request resource on success or FALSE on error.

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