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# XXXII.Filesystem Functions

# 介紹

# 需求

No external libraries are needed to build this extension, but if you want PHP to support LFS (large files) on Linux, then you need to have a recent glibc and you need compile PHP with the following compiler flags: -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64.

# 安裝

這些函數是PHP核心的一部分，不需要安裝就可使用。

# 執行時期組態

`php.ini`中的設定會影響這些函數的行為。

表格 1.Filesystem and Streams Configuration Options

Name | Default | Changeable
--- | --- | ---
allow_url_fopen | "1" | PHP_INI_SYSTEM
user_agent | NULL | PHP_INI_ALL
default_socket_timeout | "60" | PHP_INI_ALL
from | NULL | ??
auto_detect_line_endings | "Off" | PHP_INI_ALL

這裡為簡短的結構指令說明。

allow_url_fopen boolean

  This option enables the URL-aware fopen wrappers that enable accessing URL object like files. Default wrappers are provided for the access of remote files using the ftp or http protocol, some extensions like zlib may register additional wrappers.

  > 備注: This setting can only be set in php.ini due to security reasons.

  > 備注: This option was introduced immediately after the release of version 4.0.3. For versions up to and including 4.0.3 you can only disable this feature at compile time by using the configuration switch --disable-url-fopen-wrapper.

  切記!
  On Windows versions prior to PHP 4.3.0, the following functions do not support remote file accessing: include(), include_once(), require(), require_once() and the imagecreatefromXXX functions in the 參考 XLIII, Image Functions extension.

user_agent string

  Define the user agent for PHP to send.

default_socket_timeout integer

  Default timeout (in seconds) for socket based streams.

  > 備注: This configuration option was introduced in PHP 4.3.0

from="joe@example.com" string

  Define the anonymous ftp password (your email address).

auto_detect_line_endings boolean

  When turned on, PHP will examine the data read by fgets() and file() to see if it is using Unix, MS-Dos or Macintosh line-ending conventions.

  This enables PHP to interoperate with Macintosh systems, but defaults to Off, as there is a very small performance penalty when detecting the EOL conventions for the first line, and also because people using carriage-returns as item separators under Unix systems would experience non-backwards-compatible behaviour.

  > 備注: This configuration option was introduced in PHP 4.3.0

# 資源類型

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`GLOB_BRACE` (integer)

`GLOB_ONLYDIR` (integer)

`GLOB_MARK` (integer)

`GLOB_NOSORT` (integer)

`GLOB_NOCHECK` (integer)

`GLOB_NOESCAPE` (integer)

`PATHINFO_DIRNAME` (integer)

`PATHINFO_BASENAME` (integer)

`PATHINFO_EXTENSION` (integer)

`FILE_USE_INCLUDE_PATH` (integer)

`FILE_APPEND` (integer)

`FILE_IGNORE_NEW_LINES` (integer)

`FILE_SKIP_EMPTY_LINES` (integer)

# 參考

For related functions, see also the Directory and Program Execution sections.

For a list and explanation of the various URL wrappers that can be used as remote files, see also 附錄 L.

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