Get file system statistics

# eio_statvfs

(PECL eio >= 0.0.1dev)

eio_statvfs — Get file system statistics

### 说明

function eio_statvfs(
string `$path`,
int `$pri`,
callable `$callback`,
mixed `$data` = ?
): resource

eio_statvfs() returns file system statistics information in `result` argument of `callback`

### 参数

`path`
  Pathname of any file within the mounted file system
`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`.

### 返回值

eio_statvfs() returns request resource on success, 或者在失败时返回 `false`. On success assigns `result` argument of `callback` to an array.

### 示例

示例 #1 eio_statvfs() example

    <?php
    $tmp_filename = '/tmp/eio-file.tmp';
    touch($tmp_filename);

    function my_statvfs_callback($data, $result) {
        var_dump($data);
        var_dump($result);

     @unlink($data);
    }

    eio_statvfs($tmp_filename, EIO_PRI_DEFAULT, "my_statvfs_callback", $tmp_filename);
    eio_event_loop();
    ?>

以上示例的输出类似于：

    string(17) "/tmp/eio-file.tmp"
    array(11) {
      ["f_bsize"]=>
      int(4096)
      ["f_frsize"]=>
      int(4096)
      ["f_blocks"]=>
      int(262144)
      ["f_bfree"]=>
      int(262111)
      ["f_bavail"]=>
      int(262111)
      ["f_files"]=>
      int(1540815)
      ["f_ffree"]=>
      int(1540743)
      ["f_favail"]=>
      int(1540743)
      ["f_fsid"]=>
      int(0)
      ["f_flag"]=>
      int(4102)
      ["f_namemax"]=>
      int(255)
    }

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