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This document uses PHP Chinese website manual Release
(PECL eio >= 0.0.1dev)
eio_open — Opens a file
$path
, int $flags
, int $mode
, int $pri
, callable $callback
[, mixed $data
= NULL
] ) eio_open() opens file specified by
path
in access mode mode
with
path
Path of the file to be opened.
In some SAPIs(e.g. PHP-FPM) it could fail, if you don't specify full path.
flags
One of EIO_O_* constants, or their
combinations. EIO_O_* constants have the same
meaning, as their corresponding O_* counterparts
defined in fnctl.h C header file. Default is
EIO_O_RDWR
.
mode
One of EIO_S_I* constants, or their combination (via bitwise OR operator). The constants have the same meaning as their S_I* counterparts defined in » sys/stat.h C header file. Required, if a file is created. Otherwise ignored.
pri
请求的优先级: EIO_PRI_DEFAULT
, EIO_PRI_MIN
, EIO_PRI_MAX
或 NULL
。如果是
NULL
,pri
将设为
EIO_PRI_DEFAULT
。
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_open() returns file descriptor in
result
argument of callback
on success; otherwise, result
is equal to -1
.
Example #1 eio_open() example
<?php
$temp_filename = "eio-temp-file.tmp" ;
function my_close_cb ( $data , $result ) {
// Zero indicates success
var_dump ( $result == 0 );
@ unlink ( $data );
}
function my_file_opened_callback ( $data , $result ) {
// $result should contain the file descriptor
var_dump ( $result > 0 );
if ( $result > 0 ) {
// Close the file
eio_close ( $result , EIO_PRI_DEFAULT , "my_close_cb" , $data );
eio_event_loop ();
}
}
// Create new file for reading and writing
// Deny group and others to do anything with that file
eio_open ( $temp_filename , EIO_O_CREAT | EIO_O_RDWR , EIO_S_IRUSR | EIO_S_IWUSR ,
EIO_PRI_DEFAULT , "my_file_opened_callback" , $temp_filename );
eio_event_loop ();
?>
以上例程的输出类似于:
bool(true) bool(true)