Configuration directives

Httpd Options

Tabell 4-2. Httpd Options

NameDefaultChangeable
async_send"0"PHP_INI_ALL

Language Options

Tabell 4-3. Language and Misc Configuration Options

NameDefaultChangeable
short_open_tagOnPHP_INI_SYSTEM|PHP_INI_PERDIR
asp_tagsOffPHP_INI_SYSTEM|PHP_INI_PERDIR
precision"14"PHP_INI_ALL
y2k_complianceOffPHP_INI_ALL
allow_call_time_pass_referenceOnPHP_INI_SYSTEM|PHP_INI_PERDIR
expose_phpOnPHP_INI_SYSTEM

Here is a short explanation of the configuration directives.

short_open_tag boolean

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 ?>).

Not: This directive also affects the shorthand <?=, which is identical to <? echo. Use of this shortcut requires short_open_tag to be on.

asp_tags boolean

Ger dig möjligt att använda ASP-liknande taggar som <% %> som komplement till de vanliga <?php ?>-taggarna. Det inkluderar kortkommandot för utskrift av variabler: <%= $value %>. För mer information, se Växla från HTML.

Not: Stöd för ASP-liknande taggar lades till i version 3.0.4.

precision integer

Antalet signifikanta siffror visade av flyttal.

y2k_compliance boolean

Enforce year 2000 compliance (will cause problems with non-compliant browsers)

allow_call_time_pass_reference boolean

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.

expose_php boolean

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.

Resource Limits

Tabell 4-4. Resource Limits

NameDefaultChangeable
memory_limit"8M"PHP_INI_ALL

Here is a short explanation of the configuration directives.

memory_limit integer

Detta sätter hur mycket minne i bytes som ett script maximalt tillåts allokera. Direktivet förebygger att dåligt skrivna script äter upp allt minne på severn. 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.

Data Handling

Tabell 4-5. Data Handling Configuration Options

NameDefaultChangeable
track-vars"On"PHP_INI_??
arg_separator.output"&"PHP_INI_ALL
arg_separator.input"&"PHP_INI_SYSTEM|PHP_INI_PERDIR
variables_order"EGPCS"PHP_INI_ALL
register_globals"Off"PHP_INI_PERDIR|PHP_INI_SYSTEM
register_argc_argv"On"PHP_INI_PERDIR|PHP_INI_SYSTEM
post_max_size"8M"PHP_INI_SYSTEM|PHP_INI_PERDIR
gpc_order"GPC"PHP_INI_ALL
auto_prepend_file""PHP_INI_SYSTEM|PHP_INI_PERDIR
auto_append_file""PHP_INI_SYSTEM|PHP_INI_PERDIR
default_mimetype"text/html"PHP_INI_ALL
default_charset"iso-8859-1"PHP_INI_ALL
always_populate_raw_post_data"0"PHP_INI_SYSTEM|PHP_INI_PERDIR
allow_webdav_methods"0"PHP_INI_SYSTEM|PHP_INI_PERDIR

Here is a short explanation of the configuration directives.

track_vars boolean

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.

arg_separator.output string

The separator used in PHP generated URLs to separate arguments.

arg_separator.input string

List of separator(s) used by PHP to parse input URLs into variables.

Not: Every character in this directive is considered as separator!

variables_order string

Bestäm ordningen för vilka EGPCS (Environment, GET, POST, Cookie, Server) ska defineras. Standardvärdet för det här direktivet är "EGPCS". Om du t.ex. sätter värdet till "GP" kommer PHP helt att ignorera cookie-, server- och miljö-variabler och skriva över alla GET-värden med POST-värden i de fall då de har samma namn.

Se även register_globals.

register_globals boolean

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.

Not: register_globals is affected by the variables_order directive.

register_argc_argv boolean

Talar om för PHP huruvida det ska deklarera argv- och argc-variablerna (vilka skulle innehålla GET-information).

Se även kommandorad. Det här direktivet kom i och med PHP 4.0.0 och var alltid påslaget i tidigare versioner.

post_max_size integer

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.

gpc_order string

Bestäm ordningen för vilken GET/POST/COOKIE-variabler ska defineras. Standardvärdet för det här direktivet är "GPC". Om du t.ex. sätter värdet till "GP" kommer PHP helt att ignorera cookies samt skriva över alla GET-värden med POST-värden i de fall då de har samma namn.

Not: Notera att det direktivet är inte tillgängligt i PHP 4. Använd variables_order istället.

auto_prepend_file string

Specificerar namnet på en fil som inkluderas direkt före huvudfilen. Filen inkluderas på samma sätt som om den hade inkluderats med funktionen include(), vilket betyder att include_path används.

Specialvärdet none stänger av den här funktionen.

auto_append_file string

Specificerar namnet på en fil som inkluderas direkt efter huvudfilen. Filen inkluderas på samma sätt som om den hade inkluderats med funktionen include(), vilket betyder att include_path används.

Specialvärdet none stänger av den här funktionen.

Not: Om scriptet termineras med hjälp av exit(), kommer filen inte att inkluderas.

default_mimetype string

default_charset string

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_raw_post_data boolean

Always populate the $HTTP_RAW_POST_DATA variable.

allow_webdav_methods boolean

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.

Paths and Directories

Tabell 4-6. Paths and Directories Configuration Options

NameDefaultChangeable
include_pathPHP_INCLUDE_PATHPHP_INI_ALL
doc_rootPHP_INCLUDE_PATHPHP_INI_SYSTEM
user_dirNULLPHP_INI_SYSTEM
extension_dirPHP_EXTENSION_DIRPHP_INI_SYSTEM
cgi.force_redirect"1"PHP_INI_SYSTEM
cgi.redirect_status_env""PHP_INI_SYSTEM
fastcgi.impersonate"0"PHP_INI_SYSTEM

Here is a short explanation of the configuration directives.

include_path string

Specificerar en lista över kataloger där funktionerna require(), include() och fopen_with_path() ska leta efter filer. Formatet är detsamma som operativsystemets PATH-miljövariabel: listan separeras med kolon under UNIX och med semikolon under Windows.

Exempel 4-3. UNIX include_path

include_path=".:/php/includes"

Exempel 4-4. Windows include_path

include_path=".;c:\php\includes"

Standardvärdet för det här direktivet är . (bara nuvarande katalog).

doc_root string

PHP's "rotkatalog" på servern. Används bara om den inte är tom. Om s k safe mode är aktivt kan inga filer utanför den här katalogen kommas åt. 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.

user_dir string

The base name of the directory used on a user's home directory for PHP files, for example public_html.

extension_dir string

In what directory PHP should look for dynamically loadable extensions. See also: enable_dl, and dl().

extension string

Which dynamically loadable extensions to load when PHP starts up.

cgi.force_redirect boolean

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.

Not: 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.

cgi.cgi.redirect_status_env string

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.

Not: Setting this variable MAY cause security issues, KNOW WHAT YOU ARE DOING FIRST.

fastcgi.impersonate string

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.

File Uploads

Tabell 4-7. File Uploads Configuration Options

NameDefaultChangeable
file_uploads"1"PHP_INI_SYSTEM
upload_tmp_dirNULLPHP_INI_SYSTEM
upload_max_filesize"2M"PHP_INI_SYSTEM|PHP_INI_PERDIR

Here is a short explanation of the configuration directives.

file_uploads boolean

Huruvida du vill tillåta filuppladdning via HTTP eller inte. Se även upload_max_filesize-, upload_tmp_dir- och post_max_size-direktiven.

upload_tmp_dir string

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.

upload_max_filesize integer

The maximum size of an uploaded file.

General SQL

Tabell 4-8. General SQL Configuration Options

NameDefaultChangeable
sql.safe_mode"0"PHP_INI_SYSTEM

Here is a short explanation of the configuration directives.

sql.safe_mode boolean

Debugger Configuration Directives

debugger.host string

DNS name or IP address of host used by the debugger.

debugger.port string

Port number used by the debugger.

debugger.enabled boolean

Whether the debugger is enabled.