eio_read
mixed$fd,
int$length,
int$offset,
int$pri,
callable$callback,
[mixed$data = NULL]
): resource
eio_read reads up to length bytes from fd file descriptor at offset. The read bytes are stored in result argument of callback.
Parameters
- fd
-
Stream, Socket resource, or numeric file descriptor
- length
-
Maximum number of bytes to read.
- offset
-
Offset within the file.
- pri
-
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
-
callback function is called when the request is done. It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);- data
is custom data passed to the request.
- result
request-specific result value; basically, the value returned by corresponding system call.
- req
is optional request resource which can be used with functions like eio_get_last_error
- data
-
Arbitrary variable passed to callback.
Return Values
eio_read stores read bytes in result argument of callback function.