eio_custom

Execute custom request like any other eio_* call

Description

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

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)