Execute custom request like any other eio_* call

# eio_custom

(PECL eio >= 0.0.1dev)

eio_custom — Execute custom request like any other eio_* call

### Description

eio_custom(
callable `$execute`,
int `$pri`,
callable `$callback`,
mixed `$data` = NULL
): resource

eio_custom() executes custom function specified by `execute` processing it just like any other eio_* call.

### Parameters

`execute`

  Specifies the request function that should match the following prototype:

            mixed execute(mixed data);

  `callback` is event completion callback that should match the following prototype:

            void callback(mixed data, mixed result);

  `data` is the data passed to `execute` via `data` argument without modifications `result` value returned by `execute`
`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_custom() returns request resource on success, or `false` on failure.

### Examples

Example #1 eio_custom() example

`<?php
/* Callback for the custom callback */
function my_custom_callback($data, $result) {
var_dump($data);
var_dump(count($result));
var_dump($result['data_modified']);
var_dump($result['result']);
}
/* The custom request */
function my_custom($data) {
var_dump($data);
$result = array(
'result' => 1001,
'data_modified' => "my custom data",
);
return $result;
}
$data = "my_custom_data";
$req = eio_custom("my_custom", EIO_PRI_DEFAULT, "my_custom_callback", $data);
var_dump($req);
eio_event_loop();
?>`

The above example will output something similar to:

    resource(4) of type (EIO Request Descriptor)
    string(14) "my_custom_data"
    string(14) "my_custom_data"
    int(2)
    string(14) "my custom data"
    int(1001)

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