表格 4-3. Language and Misc Configuration
Options
Here is a short explanation of the configuration
directives.
Tells whether the short form ( ? ? ) of PHP's open
tag should be allowed. If you want to use PHP in
combination with XML, you can disable this option in
order to use ?xml
? inline. Otherwise, you can print it
with PHP, for example:
?php echo ' ?xml version="1.0"';
? . Also if disabled, you must use the
long form of the PHP open tag ( ?php ? ).
注: This directive also affects the shorthand ?=, which is identical to ? echo. Use of this shortcut requires short_open_tag to be on.
Enables the use of ASP-like % % tags in
addition to the usual ?php ? tags. This
includes the variable-value printing shorthand of
%= $value % . For more information, see
Escaping from HTML.
注: Support for ASP-style tags was added in 3.0.4.
The number of significant digits displayed in
floating point numbers.
Enforce year 2000 compliance (will cause
problems with non-compliant browsers)
Whether to enable the ability to force arguments
to be passed by reference at function call time. This
method is deprecated and is likely to be unsupported
in future versions of PHP/Zend. The encouraged method
of specifying which arguments should be passed by
reference is in the function declaration. You're
encouraged to try and turn this option Off and make
sure your scripts work properly with it in order to
ensure they will work with future versions of the
language (you will receive a warning each time you
use this feature, and the argument will be passed by
value instead of by reference).
See also
References Explained.
Decides whether PHP may expose the fact that it
is installed on the server (e.g. by adding its
signature to the Web server header). It is no
security threat in any way, but it makes it possible
to determine whether you use PHP on your server or
not.
Here is a short explanation of the configuration
directives.
This sets the maximum amount of memory in bytes
that a script is allowed to allocate. This helps
prevent poorly written scripts for eating up all
available memory on a server. In order to use this
directive you must have enabled it at compile time.
So, your configure line would have included: --enable-memory-limit. Note that
you have to set it to -1 if you don't want any limit
for your memory.
See also:
max_execution_time.
表格 4-5. Data Handling Configuration Options
Here is a short explanation of the configuration
directives.
If enabled, then Environment, GET, POST, Cookie,
and Server variables can be found in the global
associative arrays $_ENV,
$_GET,
$_POST, $_COOKIE, and
$_SERVER.
Note that as of PHP 4.0.3, track_vars is always turned
on.
The separator used in PHP generated URLs to
separate arguments.
List of separator(s) used by PHP to parse input
URLs into variables.
注: Every character in this directive is considered as separator!
Set the order of the EGPCS (Environment, GET,
POST, Cookie, Server) variable parsing. The default
setting of this directive is "EGPCS". Setting this to
"GP", for example, will cause PHP to completely
ignore environment variables, cookies and server
variables, and to overwrite any GET method variables
with POST-method variables of the same name.
See also
register_globals.
Tells whether or not to register the EGPCS
(Environment, GET, POST, Cookie, Server) variables as
global variables. For example; if register_globals =
on, the url
http://www.example.com/test.php?id=3 will
produce $id. Or, $DOCUMENT_ROOT from $_SERVER['DOCUMENT_ROOT']. You may
want to turn this off if you don't want to clutter
your scripts' global scope with user data. As of PHP
4.2.0, this directive defaults to
off. It's preferred to go through PHP Predefined
Variables instead, such as the
superglobals: $_ENV, $_GET,
$_POST, $_COOKIE, and
$_SERVER. Please read the
security chapter on Using
register_globals for related information.
Please note that
register_globals cannot be set at runtime (ini_set()). Although, you can use
.htaccess if your host
allows it as described above. An example .htaccess entry: php_flag register_globals
on.
注: register_globals is affected by the variables_order directive.
Tells PHP whether to declare the argv argc
variables (that would contain the GET
information).
See also
command line. Also, this directive became
available in PHP 4.0.0 and was always "on" before
that.
Sets max size of post data allowed. This setting
also affects file upload. To upload large files, this
value must be larger than
upload_max_filesize.
If memory limit is enabled by your configure
script,
memory_limit also affects file uploading.
Generally speaking,
memory_limit should be larger than post_max_size.
Set the order of GET/POST/COOKIE variable
parsing. The default setting of this directive is
"GPC". Setting this to "GP", for example, will cause
PHP to completely ignore cookies and to overwrite any
GET method variables with POST-method variables of
the same name.
注: This option is not available in PHP 4. Use variables_order instead.
Specifies the name of a file that is
automatically parsed before the main file. The file
is included as if it was called with the
include() function, so
include_path is used.
The special value
none disables auto-prepending.
Specifies the name of a file that is
automatically parsed after the main file. The file is
included as if it was called with the
include() function, so
include_path is used.
The special value
none disables auto-appending.
注: If the script is terminated with exit(), auto-append will not occur.
As of 4.0b4, PHP always outputs a character
encoding by default in the Content-type: header. To
disable sending of the charset, simply set it to be
empty.
Always populate the $HTTP_RAW_POST_DATA
variable.
Allow handling of WebDAV http requests within
PHP scripts (eg. PROPFIND, PROPPATCH, MOVE, COPY,
etc..) If you want to get the post data of those
requests, you have to set
always_populate_raw_post_data as well.
See also: magic_quotes_gpc,
magic-quotes-runtime, and
magic_quotes_sybase.
Here is a short explanation of the configuration
directives.
Specifies a list of directories where the
require(), include() and fopen_with_path() functions look for
files. The format is like the system's PATH environment variable: a list of
directories separated with a colon in UNIX or
semicolon in Windows.
Using a . in the
include path allows for relative includes as it means
the current directory.
PHP's "root directory" on the server. Only used
if non-empty. If PHP is configured with safe
mode, no files outside this directory are served.
If PHP was not compiled with FORCE_REDIRECT, you
SHOULD set doc_root if you are running php as a CGI
under any web server (other than IIS) The alternative
is to use the
cgi.force_redirect configuration below.
The base name of the directory used on a user's
home directory for PHP
files, for example
public_html.
In what directory PHP should look for
dynamically loadable extensions. See also: enable_dl, and
dl().
Which dynamically loadable extensions to load
when PHP starts up.
cgi.force_redirect is necessary to provide
security running PHP as a CGI under most web servers.
Left undefined, PHP turns this on by default. You can
turn it off AT YOUR OWN RISK.
注: Windows Users: You CAN safely turn this off for IIS, in fact, you MUST. To get OmniHTTPD or Xitami to work you MUST turn it off.
If cgi.force_redirect is turned on, and you are
not running under Apache or Netscape (iPlanet) web
servers, you MAY need to set an environment variable
name that PHP will look for to know it is OK to
continue execution.
注: Setting this variable MAY cause security issues, KNOW WHAT YOU ARE DOING FIRST.
FastCGI under IIS (on WINNT based OS) supports
the ability to impersonate security tokens of the
calling client. This allows IIS to define the
security context that the request runs under.
mod_fastcgi under Apache does not currently support
this feature (03/17/2002) Set to 1 if running under
IIS. Default is zero.
Here is a short explanation of the configuration
directives.
Whether or not to allow HTTP file uploads. See
also the
upload_max_filesize,
upload_tmp_dir, and
post_max_size directives.
The temporary directory used for storing files
when doing file upload. Must be writable by whatever
user PHP is running as. If
not specified PHP will use the system's default.
The maximum size of an uploaded file.