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

### 说明

function 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.

### 参数

`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`
  请求的优先级：`EIO_PRI_DEFAULT`，`EIO_PRI_MIN`，`EIO_PRI_MAX` 或 `null`。如果是 `null`，`pri` 将设为 `EIO_PRI_DEFAULT`。
`callback`

  `callback` 函数在请求完成时被调用。其应匹配一下原型：

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

  `data`
    传递给请求的用户数据。
  `result`
    针对请求的结果的值。通常是相应的系统调用返回的值。
  `req`
    可选的请求资源，可被 eio_get_last_error() 之类的函数使用。
`data`
  Arbitrary variable passed to `callback`.

### 返回值

eio_custom() returns request resource on success, 或者在失败时返回 `false`.

### 示例

示例 #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();
    ?>

以上示例的输出类似于：

    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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