Php/docs/function.eio-grp
eio_grp
(PECL eio >= 0.0.1dev)
eio_grp — Creates a request group
说明
eio_grp
( callable $callback
[, string $data = NULL
] ) : resource
eio_grp() creates a request group.
参数
callbackcallback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 $req]);data传递给请求的用户数据。
result针对请求的结果的值。通常是相应的系统调用返回的值。
req可选的请求资源，可被 eio_get_last_error() 之类的函数使用。
dataArbitrary variable passed to
callback.
返回值
eio_grp() returns request group resource on success or false on error.
范例
Example #1 eio_grp() example
<?php$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($temp_filename, EIO_O_RDWR | EIO_O_APPEND , NULL, EIO_PRI_DEFAULT, "my_grp_file_opened_callback", NULL);// Add request to the groupeio_grp_add($grp, $req);// Process requestseio_event_loop();?>
以上例程的输出类似于：
string(4) "some"
