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Eio Functions
PHP Manual

# eio_open

(PECL eio >= 0.0.1dev)

eio_open — Opens a file

### Description

resource eio_open ( string `$path` , int `$flags` , int `$mode` , int `$pri` , callable `$callback` [, mixed `$data` = NULL ] )

eio_open() opens file specified by `path` in access mode `mode` with

### Parameters

`path`

  Path of the file to be opened.

  Warning

  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`

  The request priority: `EIO_PRI_DEFAULT`, `EIO_PRI_MIN`, `EIO_PRI_MAX`, or `NULL`. If `NULL` passed, `pri` internally is set to `EIO_PRI_DEFAULT`.

`callback`

  `callback` function is called when the request is done. It should match the following prototype:

  `void callback(mixed $data, int $result[, resource $req]);`
  `data`

    is custom data passed to the request.

  `result`

    request-specific result value; basically, the value returned by corresponding system call.

  `req`

    is optional request resource which can be used with functions like eio_get_last_error()

`data`

  Arbitrary variable passed to `callback`.

### Return Values

eio_open() returns file descriptor in `result` argument of `callback` on success; otherwise, `result` is equal to `-1`.

### Examples

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", $data);
eio_event_loop();
}
}
// Create new file for reading and writing
// Deny group and others to do anything with that file
eio_open($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();
?>`

The above example will output something similar to:

    bool(true)
    bool(true)

### See Also

- eio_mknod

eio_nthreads
eio_poll
Eio Functions
PHP Manual