eio_grp
(PECL eio >= 0.0.1dev)
eio_grp — Creates a request group
參數
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callback callback函式在請求完成時被呼叫。其應匹配一下原型：void callback(mixed $data, int $result[, resource $req]);-
data 傳遞給請求的用戶數據。
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result 針對請求的結果的值。通常是相應的系統呼叫返回的值。
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req 可選的請求資源，可被 eio_get_last_error() 之類的函式使用。
-
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data Arbitrary variable passed to
callback.
返回值
eio_grp() returns request group resource on success, 或者在失敗時返回 false.
範例
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();
?> 以上例程的輸出類似於：
string(4) "some"
參見
- eio_grp_cancel() - Cancels a request group
- eio_grp_add() - Adds a request to the request group