(PECL eio >= 0.0.1dev)
eio_grp — Creates a request group
eio_grp() creates a request group.
callback
callback
函數(shù)在請(qǐng)求完成時(shí)被調(diào)用。其應(yīng)匹配一下原型:
void callback(mixed $data, int $result[, resource $req]);
data
傳遞給請(qǐng)求的用戶數(shù)據(jù)。
result
針對(duì)請(qǐng)求的結(jié)果的值。通常是相應(yīng)的系統(tǒng)調(diào)用返回的值。
req
可選的請(qǐng)求資源,可被 eio_get_last_error() 之類的函數(shù)使用。
data
Arbitrary variable passed to callback
.
eio_grp() returns request group resource on success, 或者在失敗時(shí)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();
?>
以上例程的輸出類似于:
string(4) "some"