�� 4. Runtime Configuration

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The configuration file
How to change configuration settings
Miscellaneous configuration directives

The configuration file

The configuration file (called php3.ini in PHP 3.0, and simply php.ini as of PHP 4.0) is read when PHP starts up. For the server module versions of PHP, this happens only once when the web server is started. For the CGI and CLI version, it happens on every invocation.

The default location of php.ini is a compile time option (see the FAQ entry), but can be changed for the CGI and CLI version with the -c command line switch, see the chapter about using PHP from the command line. You can also use the environment variable PHPRC for an additional path to search for a php.ini file.

�`: The Apache web server changes the directory to root at startup causing PHP to attempt to read php.ini from the root filesystem if it exists.

Not every PHP directive is documented below. For a list of all directives, please read your well commented php.ini file. You may want to view the latest from CVS.

�`: The default value for the PHP directive register_globals changed from on to off in PHP 4.2.0.

�d�� 4-1. php.ini example
; any text on a line after an unquoted semicolon (;) is ignored [php] ; section markers (text within square brackets) are also ignored ; Boolean values can be set to either: ; true, on, yes ; or false, off, no, none register_globals = off magic_quotes_gpc = yes ; you can enclose strings in double-quotes include_path = ".:/usr/local/lib/php" ; backslashes are treated the same as any other character include_path = ".;c:\php\lib"

add a note User Contributed Notes
Runtime Configuration

Jorrit Schippers
26-May-2004 10:33


For IIS users: If you experience high parsetimes, try to set output_buffering to On. IIS has problems with scripts outputting many small pieces of text, and with output_buffering = On, PHP sends the whole page to IIS in one piece.

Evan
04-Mar-2004 01:13


Allowing an extraordinarily large request size is probably a bad idea.  This could potentially supply someone with the fodder to run a DOS attack.  If you need to upload huge files, make it bigger, not unlimited.

pettijhn at uiuc dot edu
07-Nov-2003 06:23


After setting a bunch of variables trying to fix a file upload error (files over a certain size resulted in the connection dying), I learned that in /etc/httpd/conf.d/php.conf there is a line LimitRequestBody 524288. Comment that out, restart apache.

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