Installation
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Installing/Configuring
PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Filesystem and Streams Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
allow_url_fopen | "1" | PHP_INI_ALL | PHP_INI_ALL in PHP <= 4.3.4. PHP_INI_SYSTEM in PHP < 6. Available since PHP 4.0.4.
allow_url_include | "0" | PHP_INI_ALL | PHP_INI_SYSTEM in PHP 5. Available since PHP 5.2.0.
user_agent | NULL | PHP_INI_ALL | Available since PHP 4.3.0.
default_socket_timeout | "60" | PHP_INI_ALL | Available since PHP 4.3.0.
from | "" | PHP_INI_ALL |
auto_detect_line_endings | "0" | PHP_INI_ALL | Available since PHP 4.3.0.

Here's a short explanation of the configuration directives.

`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.

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

  > Note: 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` .

  Warning

  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 Image Functions extension.

`allow_url_include` boolean

  This option allows the use of URL-aware fopen wrappers with the following functions: include(), include_once(), require(), require_once().

  > Note: This setting requires allow_url_fopen to be on.

`user_agent` string

  Define the user agent for PHP to send.

`default_socket_timeout` integer

  Default timeout (in seconds) for socket based streams.

  > Note: This configuration option was introduced in PHP 4.3.0

`from` 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.

  > Note: This configuration option was introduced in PHP 4.3.0

Installation
Resource Types
Installing/Configuring
PHP Manual