PHP Eio 函数 Reads through a whole directory

说明

eio_readdir ( string $path , int $flags , int $pri , callable $callback [, string $data = NULL ] ) : resource

Reads through a whole directory(via the opendir, readdir and closedir system calls) and returns either the names or an array in result argument of callback function, depending on the flags argument.

参数

path

Directory path.

flags

Combination of EIO_READDIR_* constants.

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_readdir() returns request resource on success, or FALSE on error. Sets result argument of callback function according to flags:

EIO_READDIR_DENTS ( integer): eio_readdir() flag. If specified, the result argument of the callback becomes an array with the following keys: 'names' - array of directory names 'dents' - array of struct eio_dirent-like arrays having the following keys each: 'name' - the directory name; 'type' - one of EIO_DT_* constants; 'inode' - the inode number, if available, otherwise unspecified;
EIO_READDIR_DIRS_FIRST ( integer): When this flag is specified, the names will be returned in an order where likely directories come first, in optimal stat order.
EIO_READDIR_STAT_ORDER ( integer): When this flag is specified, then the names will be returned in an order suitable for stat'ing each one. When planning to stat() all files in the given directory, the returned order will likely be fastest.
EIO_READDIR_FOUND_UNKNOWN ( integer)

Node types:

EIO_DT_UNKNOWN ( integer): Unknown node type(very common). Further stat() needed.
EIO_DT_FIFO ( integer): FIFO node type
EIO_DT_CHR ( integer): Node type
EIO_DT_MPC ( integer): Multiplexed char device (v7+coherent) node type
EIO_DT_DIR ( integer): Directory node type
EIO_DT_NAM ( integer): Xenix special named file node type
EIO_DT_BLK ( integer): Node type
EIO_DT_MPB ( integer): Multiplexed block device (v7+coherent)
EIO_DT_REG ( integer): Node type
EIO_DT_NWK ( integer)
EIO_DT_CMP ( integer): HP-UX network special node type
EIO_DT_LNK ( integer): Link node type
EIO_DT_SOCK ( integer): Socket node type
EIO_DT_DOOR ( integer): Solaris door node type
EIO_DT_WHT ( integer): Node type
EIO_DT_MAX ( integer): Highest node type value

范例

Example #1 eio_readdir() example

 <?php
/* Is called when eio_readdir() finishes */
function my_readdir_callback($data, $result) {
    echo __FUNCTION__, " called\n";
    echo "data: "; var_dump($data);
    echo "result: "; var_dump($result);
    echo "\n";
}

eio_readdir("/var/spool/news", EIO_READDIR_STAT_ORDER | EIO_READDIR_DIRS_FIRST,
  EIO_PRI_DEFAULT, "my_readdir_callback");
eio_event_loop();
?>

以上例程的输出类似于：

my_readdir_callback called
data: NULL
result: array(2) {
 ["names"]=>
  array(7) {
   [0]=>
    string(7) "archive"
    [1]=>
    string(8) "articles"
    [2]=>
    string(8) "incoming"
    [3]=>
    string(7) "innfeed"
    [4]=>
    string(8) "outgoing"
    [5]=>
    string(8) "overview"
    [6]=>
    string(3) "tmp"
  }
 ["dents"]=>
  array(7) {
   [0]=>
    array(3)
    {
     ["name"]=>
      string(7)
      "archive"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393265)
    }
   [1]=>
    array(3)
    {
     ["name"]=>
      string(8)
      "articles"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393266)
    }
   [2]=>
    array(3)
    {
     ["name"]=>
      string(8)
      "incoming"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393267)
    }
   [3]=>
    array(3)
    {
     ["name"]=>
      string(7)
      "innfeed"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393269)
    }
   [4]=>
    array(3)
    {
     ["name"]=>
      string(8)
      "outgoing"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393270)
    }
   [5]=>
    array(3)
    {
     ["name"]=>
      string(8)
      "overview"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393271)
    }
   [6]=>
    array(3)
    {
     ["name"]=>
      string(3)
      "tmp"
      ["type"]=>
      int(4)
      ["inode"]=>
      int(393272)
    }
  }
}