Php/docs/function.eio-open
eio_open
(PECL eio >= 0.0.1dev)
eio_open — Opens a file
说明
eio_open
( string $path
, int $flags
, int $mode
, int $pri
, callable $callback
[, mixed $data = NULL
] ) : resource
eio_open() opens file specified by
path in access mode mode with
参数
pathPath of the file to be opened.
Warning
In some SAPIs(e.g. PHP-FPM) it could fail, if you don't specify full path.
flagsOne of EIO_O_* constants, or their combinations. EIO_O_* constants have the same meaning, as their corresponding O_* counterparts defined in
fnctl.hC header file. Default isEIO_O_RDWR.modeOne 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。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 $req]);data传递给请求的用户数据。
result针对请求的结果的值。通常是相应的系统调用返回的值。
req可选的请求资源，可被 eio_get_last_error() 之类的函数使用。
dataArbitrary variable passed to
callback.
返回值
eio_open() returns file descriptor in
result argument of callback
on success; otherwise, result is equal to -1.
范例
Example #1 eio_open() example
<?php$temp_filename = "eio-temp-file.tmp";/* Is called when eio_close() finishes */function my_close_cb($data, $result) { // Zero indicates success var_dump($result == 0); @unlink($data);}/* Is called when eio_open() finishes */function my_file_opened_callback($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", $data); eio_event_loop(); }}// Create new file for reading and writing// Deny group and others to do anything with that fileeio_open($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)
