PHP Manual: Runtime Configuration

Runtime Configuration

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

**PHP Options/Inf Configuration Options**
Name	Default	Changeable	Changelog
assert.active	"1"	PHP_INI_ALL
assert.bail	"0"	PHP_INI_ALL
assert.warning	"1"	PHP_INI_ALL
assert.callback	NULL	PHP_INI_ALL
assert.quiet_eval	"0"	PHP_INI_ALL
assert.exception	"0"	PHP_INI_ALL	Available since PHP 7.0.0.
enable_dl	"1"	PHP_INI_SYSTEM	This deprecated feature will certainly be removed in the future.
max_execution_time	"30"	PHP_INI_ALL
max_input_time	"-1"	PHP_INI_PERDIR	Available since PHP 4.3.0.
max_input_nesting_level	"64"	PHP_INI_PERDIR	Available since PHP 5.2.3.
max_input_vars	1000	PHP_INI_PERDIR	Available since PHP 5.3.9.
magic_quotes_gpc	"1"	PHP_INI_PERDIR	PHP_INI_ALL in PHP <= 4.2.3. Removed in PHP 5.4.0.
magic_quotes_runtime	"0"	PHP_INI_ALL	Removed in PHP 5.4.0.
zend.enable_gc	"1"	PHP_INI_ALL	Available since PHP 5.3.0.

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

assert.active boolean

Enable assert evaluation.

assert.bail boolean

Terminate script execution on failed assertions.

assert.warning boolean

Issue a PHP warning for each failed assertion.

assert.callback string

User function to call on failed assertions.

assert.quiet_eval boolean

Use the current setting of error_reporting during assertion expression evaluation. If enabled, no errors are shown (implicit error_reporting(0)) while evaluation. If disabled, errors are shown according to the settings of error_reporting

assert.exception boolean

Issue an AssertionError exception for the failed assertion.

enable_dl boolean

This directive is really only useful in the Apache module version of PHP. You can turn dynamic loading of PHP extensions with dl on and off per virtual server or per directory.

The main reason for turning dynamic loading off is security. With dynamic loading, it's possible to ignore all open_basedir restrictions. The default is to allow dynamic loading, except when using safe mode. In safe mode, it's always impossible to use dl.

max_execution_time integer

This sets the maximum time in seconds a script is allowed to run before it is terminated by the parser. This helps prevent poorly written scripts from tying up the server. The default setting is 30. When running PHP from the command line the default setting is 0.

The maximum execution time is not affected by system calls, stream operations etc. Please see the set_time_limit function for more details.

You can not change this setting with ini_set when running in safe mode. The only workaround is to turn off safe mode or by changing the time limit in the php.ini.

Your web server can have other timeout configurations that may also interrupt PHP execution. Apache has a Timeout directive and IIS has a CGI timeout function. Both default to 300 seconds. See your web server documentation for specific details.

max_input_time integer

This sets the maximum time in seconds a script is allowed to parse input data, like POST and GET. Timing begins at the moment PHP is invoked at the server and ends when execution begins. The default setting is -1, which means that max_execution_time is used instead. Set to 0 to allow unlimited time.

max_input_nesting_level integer

Sets the max nesting depth of input variables (i.e. $_GET, $_POST.)

max_input_vars integer

How many input variables may be accepted (limit is applied to $_GET, $_POST and $_COOKIE superglobal separately). Use of this directive mitigates the possibility of denial of service attacks which use hash collisions. If there are more input variables than specified by this directive, an E_WARNING is issued, and further input variables are truncated from the request.

magic_quotes_gpc boolean

Warning

This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.

Sets the magic_quotes state for GPC (Get/Post/Cookie) operations. When magic_quotes are on, all ' (single-quote), " (double quote), \ (backslash) and NUL's are escaped with a backslash automatically.

Note:
If the magic_quotes_sybase directive is also ON it will completely override magic_quotes_gpc. Having both directives enabled means only single quotes are escaped as ''. Double quotes, backslashes and NUL's will remain untouched and unescaped.