Here's a short explanation of
the configuration directives.
-
assert.active
bool
-
Enable assert evaluation.
zend.assertions should be
used instead to control the behaviour of assert.
WarningThis feature has been
DEPRECATED as of PHP 8.3.0. Relying on this feature
is highly discouraged.
-
assert.bail
bool
-
Terminate script execution on failed assertions.
WarningThis feature has been
DEPRECATED as of PHP 8.3.0. Relying on this feature
is highly discouraged.
-
assert.warning
bool
-
Issue a PHP warning for each failed assertion.
WarningThis feature has been
DEPRECATED as of PHP 8.3.0. Relying on this feature
is highly discouraged.
-
assert.callback
string
-
User function to call on failed assertions.
WarningThis feature has been
DEPRECATED as of PHP 8.3.0. Relying on this feature
is highly discouraged.
-
assert.quiet_eval
bool
-
Warning
This feature was REMOVED as of PHP 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.exception
bool
-
Issue an AssertionError exception for the failed
assertion.
WarningThis feature has been
DEPRECATED as of PHP 8.3.0. Relying on this feature
is highly discouraged.
-
enable_dl
bool
-
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_time
int
-
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.
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
int
-
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
int
-
Sets the max nesting depth of
input variables (i.e.
$_GET, $_POST.)
-
max_input_vars
int
-
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_gc
bool
-
Enables or disables the circular reference collector.
-
zend.max_allowed_stack_size
int
-
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_size
int
-
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_size
int
-
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.