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(PECL eio >= 0.0.1dev)
eio_grp — Createsa request group.
$callback
[, string $data
= NULL
] )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 or FALSE
on error.
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 ;
function my_grp_done ( $data , $result ) {
// Remove the file, if it still exists
@ unlink ( $data );
}
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 );
}
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 ();
?>
以上例程的输出类似于:
string(4) "some"