(PECL eio >= 0.0.1dev)
eio_grp — Creates a request group
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.
eio_grp() returns request group resource on success, 或者在失败时返回 false.
示例 #1 eio_grp() example
<?php
$temp_filename = dirname(__FILE__) ."/eio-file.tmp";
$fp = fopen($temp_filename, "w");
fwrite($fp, "some data");
fclose($fp);
$my_file_fd = NULL;
/* Is called when the group requests are done */
function my_grp_done($data, $result) {
// Remove the file, if it still exists
@unlink($data);
}
/* Is called when the temporary file is opened */
function my_grp_file_opened_callback($data, $result) {
global $my_file_fd, $grp;
$my_file_fd = $result;
$req = eio_read($my_file_fd, 4, 0,
EIO_PRI_DEFAULT, "my_grp_file_read_callback");
eio_grp_add($grp, $req);
}
/* Is called when the file is read */
function my_grp_file_read_callback($data, $result) {
global $my_file_fd, $grp;
var_dump($result);
// Create request to close the file
$req = eio_close($my_file_fd);
// Add request to the group
eio_grp_add($grp, $req);
}
// Create request group
$grp = eio_grp("my_grp_done", $temp_filename);
// Create request
$req = eio_open($temp_filename, EIO_O_RDWR | EIO_O_APPEND , NULL,
EIO_PRI_DEFAULT, "my_grp_file_opened_callback", NULL);
// Add request to the group
eio_grp_add($grp, $req);
// Process requests
eio_event_loop();
?>以上示例的输出类似于：
string(4) "some"