Cancels a request

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# eio_cancel

(PECL eio >= 0.0.1dev)

eio_cancel — Cancels a request

### Description

void eio_cancel ( resource `$req` )

eio_cancel() cancels a request specified by `req`

### Parameters

`req`

  The request resource

`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

No value is returned.

### Examples

Example #1 eio_cancel() example

`<?php
/* Is called when eio_nop() finished */
function my_nop_cb($data, $result) {
echo "my_nop ", $data, "\n";
}
// This eio_nop() call will be cancelled
$req = eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "1");
var_dump($req);
eio_cancel($req);
// This time eio_nop() will be processed
eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "2");
// Process requests
eio_event_loop();
?>`

The above example will output something similar to:

    resource(4) of type (EIO Request Descriptor)
    my_nop 2

### See Also

- eio_grp_cancel

eio_busy
eio_chmod
Eio Functions
PHP Manual