PHP Options/Info Configuration Options

Runtime Runtime

Constants

Title

assert.activebool

Enable assert() evaluation. zend.assertions should be used instead to control the behaviour of assert().

Feature-8-3-0

assert.bailbool

Terminate script execution on failed assertions.

Feature-8-3-0

assert.warningbool

Issue a PHP warning for each failed assertion.

Feature-8-3-0

assert.callbackstring

User function to call on failed assertions.

Feature-8-3-0

assert.quiet_evalbool

Removed-8-0-0

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.exceptionbool

Issue an AssertionError exception for the failed assertion.

Feature-8-3-0

enable_dlbool

This directive allows to turn dynamic loading of PHP extensions with dl() on and off.

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.

max_execution_timeint

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.

On non Windows systems, the maximum execution time is not affected by system calls, stream operations etc. Please see the set_time_limit() function for more details.

When PHP is compiled with --enable-zend-max-execution-timers (the default for ZTS builds since PHP 8.3.0), the limit is tracked with POSIX per-thread timers that measure elapsed time, so time spent sleeping or waiting on I/O counts towards it. The default setitimer(ITIMER_PROF) based tracking measures CPU time instead.

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_timeint

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_levelint

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

max_input_varsint

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.

zend.enable_gcbool

Enables or disables the circular reference collector.

zend.max_allowed_stack_sizeint

The maximum native stack space that the operating system allows the program to consume. Trying to consume more than the operating system allows typically results in a hard crash with no easily available debugging information. To make debugging easier, the engine throws an Error before it happens (when the program uses more than zend.max_allowed_stack_size-zend.reserved_stack_size bytes of stack).

Recursion in user-defined code does not consume native stack space. However, internal functions and magic methods do. Very deep recursion involving these functions can cause the program to exhaust all available native stack space.

Possible values for this parameter are:

• 0: Auto-detect the maximum native stack space that the operating system allows the program to consume. This is the default. When detection is not possible, a known system default is used.
• -1: Disables stack size checking in the engine.
• Positive integer: A fixed size, in bytes. Setting this value too high has the same effect as disabling stack size checking.

As the stack size of fibers is determined by fiber.stack_size, the value of this parameter is used instead of zend.max_allowed_stack_size when checking stack usage during the execution of a Fiber.

Note

This is not related to stack buffer overflows, and is not a security feature.

zend.reserved_stack_sizeint

The reserved stack size, in bytes. This is subtracted from the max allowed stack size, as a buffer, when checking the stack size.

Possible values for this parameter are:

• 0: Auto-detect a sensible size.
• Positive integer: A fixed size, in bytes.

fiber.stack_sizeint

The native stack size, in bytes, allocated for each Fiber.

The default value is 1MiB on systems with a pointer size lower than 8 bytes, or 2MiB otherwise.