In-depth analysis of the php.ini configuration file, _PHP tutorial

In-depth analysis of the php.ini configuration file,

[PHP]
; PHP is still an evolving tool, and its functions are still growing Local deletion
; And the setting changes in php.ini can reflect considerable changes,
; Before using a new PHP version, it will be beneficial to study php.ini

;;;;;;;;;;;;;;;;;;;;
; About this file;
;;;;;;;;;;;;;;;;;; ;;

; This file controls many aspects of PHP. In order for PHP to read this file, it must be named
; 'php.ini'. PHP will search for the file in these places in sequence: the current working directory; the path specified by the environment variable PHPRC
;; the path specified during compilation.
; Under Windows, the path when compiling is the Windows installation directory.
; In command line mode, the search path of php.ini can be replaced with the -c parameter.

; The syntax of this file is very simple. Whitespace characters and lines starting with a semicolon ';' are simply ignored (as you might have guessed
;). Section titles (eg: [Foo]) are also simply ignored, even though they may
; have some meaning in the future.

; directives are specified using the following syntax:
; directive identifier = value
; directive = value
; directive identifier is *case-sensitive* - foo=bar is different from FOO = bar.

; The value can be a string, a number, a PHP constant (such as: E_ALL or M_PI), an INI constant
; a (On, Off, True, False, Yes, No and None), or an expression
; (e.g.: E_ALL & ~E_NOTICE), or a quoted string (" foo" ).

; Expressions in INI files are restricted Bitwise operators and parentheses.
; | bitwise OR
; & bitwise AND
; ~ bitwise NOT
; ! boolean NOT

; Boolean flags can be set to 1, On, True or Yes. status.
; They can be set to off with the values ​​0, Off, False or No.

; An empty string can be represented by not writing anything after the equal sign, or using the None keyword:

; foo = ; Set foo to an empty string
; foo = none ; Set foo to the empty string
; foo = " none" ; Set foo to the string 'none'

; If you use constants in value settings, and these constants are dynamic Called into extension libraries (either PHP extensions, or Zend extensions), you can only use these constants *after* the lines that call in these extensions.

; All values ​​set in the php.ini-dist file are the same as the built-in defaults (that is, if php.ini
; is not used or you delete these lines , the default value is the same).

; Language options ;
;;;;;;;;;;;;;;;;;;;;;;;

; Make the PHP scripting language engine available under Apache.
short_open_tag = On
; allows tags to be recognized.
asp_tags = Off
; Allow ASP-style tags
precision = 14
; The number of significant digits when displaying floating point type numbers

; Whether to turn on Y2K compliance (may cause problems in non-Y2K compliant browsers)

; Output buffering allows you to send header (including cookies) lines even after outputting the body content
; The cost is that the output layer slows down a little. You can use Output Cache to turn on output caching at runtime,
; or set the directive to On here to turn on output caching for all files.
output_handler = ; You can redirect all output of your script to a function,
; doing so may be useful for processing or logging it.
; For example, if you set this output_handler to "ob_gzhandler",
; the output will be transparently compressed for browsers that support gzip or deflate encoding.
; Set an output processor to automatically enable output buffering.

; Force flush to let PHP tell the output layer to automatically refresh its own data after each output block.
; This is equivalent to calling the flush() function after every print() or echo() call and after every HTML block.
; Turning on this setting will cause serious runtime conflicts. It is recommended to turn it on only during debugging.

; Whether to force parameters to be passed by reference when calling the function. This method was protested
; and may no longer be supported in future versions of PHP/Zend.
; It is encouraged to specify which parameters are passed by reference in the function declaration.
; You are encouraged to try turning this option off and verify that your scripts still work, to ensure that they will still work
; in future versions of the language. (You will get a warning every time you use this feature, and arguments will be passed by value rather than by reference
;).

; Safe Mode Safe Mode
safe_mode = Off
safe_mode_exec_dir =
safe_mode_allowed_env_vars = PHP_
; ? Setting certain environment variables
; ? may be a potential security breach.
; The directive contains a comma-separated list of prefixes. In safe mode, users can only replace
; with the values ​​of environment variables that begin with the prefixes listed here.
; By default, users will only be able to set environment variables starting with PHP_ (eg: PHP_FOO=BAR).
; NOTE: If this directive is empty, PHP will let the user change any environment variable!

safe_mode_protected_env_vars = LD_LIBRARY_PATH
; This directive contains a comma-separated list of environment variables that the end user will not be able to change using putenv ().
; These variables are protected even when safe_mode_allowed_env_vars is set to allowed.

disable_functions =
; This directive allows you to disable specific functions for security reasons.
; It accepts a comma separated list of function names.
; This instruction is *not* affected by whether safe mode is turned on or not.

; Color of syntax highlighting mode.
; As long as it is acceptable, it will work.

highlight.string = #DD0000
highlight.comment = #FF8000
highlight.keyword = #007700
highlight.bg = #FFFFFF
highlight.default = #0000BB
highlight. html = #000000

; Misc Misc
expose_php = Off
; Determines whether PHP should indicate the fact that it is installed on the server (for example: by adding it to the signal it — PHP — sends to the Web service
;).
; (My personal opinion is to turn this off when any power-by header appears.)
; It does not pose a security threat, but it makes it possible to check whether it is installed on your server. Made possible with PHP.

; Resource Limits ;
;;;;;;;;;;;;;;;;;;;;;

max_execution_time = 30 ; The maximum execution time of each script, in seconds
memory_limit = 8388608 ; The maximum total amount of memory that can be used by a script (here is 8MB)

; Error handling and logging;
; Error control and registration;

; Error reporting is bitwise. Or add up the numbers to get the desired error reporting level.
; E_ALL - all errors and warnings
; E_ERROR - fatal runtime errors
; E_WARNING - runtime warnings (non-fatal errors)
; E_PARSE - compile-time parsing errors
; E_NOTICE - runtime reminder (these are often caused by bugs in your code,
; may also be caused by intentional behavior. (eg: automatic initialization of an uninitialized variable to a
; null character based on String fact using an uninitialized variable)

; E_CORE_ERROR - Fatal error that occurs during the initialization process of PHP startup
; E_CORE_WARNING - Warning (non-fatal error) that occurs during the initialization process of PHP startup
; E_COMPILE_ERROR - Fatal error during compilation
; E_COMPILE_WARNING - compile-time warning (non-fatal error)
; E_USER_ERROR - user-generated error message
; E_USER_WARNING - user-generated warning message
; E_USER_NOTICE - user-generated reminder message
; Example:
; error_reporting = E_ALL & ~E_NOTICE ; Show all errors except reminders
; error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; Show only errors
error_reporting = E_ALL & ~E_NOTICE ; Show all Errors, in addition to reminders
display_errors = On ; display error messages (as part of the output)
; On the final published web site, it is strongly recommended that you turn off this feature and use
; error logs instead (see below).
; Continuing to enable display_errors on the final published web site may
; expose some security-related information, such as file paths on your web service,
; your database configuration, or other information.
display_startup_errors = Off ; Even when display_erroes is turned on, errors that occur during the PHP startup step
; will not be displayed.
; It is strongly recommended to keep display_startup_errors turned off,
; except during error correction.
log_errors = Off ; Record errors in a log file (server-specific log, stderr standard error output, or error_log (below))
; As stated above, it is strongly recommended that you log errors in the final published web site Log errors
; instead of direct error output.

track_errors = Off ; Save the latest error/warning message in the variable $php_errormsg (boolean)
;error_prepend_string = " " ; The string output before the error message
;error_append_string = " " ; The string output after
;error_log = filename; Record the error log in the specified file
;error_log = syslog; Record the error log in the system log syslog (event log under NT, invalid under Windows 95)
warn_plus_overloading = Off ; Warn when using ' ' with string

; Data Handling;

variables_order = "EGPCS"; This instruction describes the PHP record
; GET, POST, Cookie, Environment and Built-in of these variables order.
; (represented by G, P, C, E & S, usually referenced by EGPCS or GPC).
; Record from left to right, with new values ​​replacing old values.

register_globals = On ; Whether to register these EGPCS variables as global variables.
; You may want to turn this off if you don't want user data to be cluttered globally.
; This makes more sense in conjunction with track_vars — that way you can access all GPC variables via the
; $HTTP_*_VARS[] array.

register_argc_argv = On; This instruction tells PHP whether to declare argv and argc variables
; (Note: here argv is an array and argc is the number of variables)
; (which contains data passed by the GET method) .
; If you don't want to use these variables, you should turn them off to improve performance.

track_vars = On ; Make the $HTTP_*_VARS[] array valid, here* is replaced with
; ENV, POST, GET, COOKIE or SERVER when used.
post_max_size = 8M; PHP will accept the POST data Maximum size.

gpc_order = "GPC" ; This directive was objected to. Use variables_order instead.

; Magic quotes
magic_quotes_gpc = On ; Use magic quotes in the input GET/POST/Cookie data
; (The original text is like this, haha, the so-called magic quotes should refer to using escape characters to add quotes On the special control characters, such as '....)
magic_quotes_runtime= Off; Use magic quotes for data generated during runtime,
; For example: the data obtained by SQL query is obtained by using the exec() function Data, etc.
magic_quotes_sybase = Off ; Use Sybase-style magic quotes (use '' out ' instead of ')

; Automatically add files before and after PHP documents
auto_prepend_file =
auto_append_file =

; Like 4.04b4, PHP by default always outputs the encoding of a character in the "Content-type:" header.
; Disables the output character set, as long as it is set to empty.
; PHP's built-in default is text/html
default_mimetype = " text/html"
; default_charset = " iso-8859-1"

;;;;;;;;;;;;;;;;;;;;;;;;;;
; Paths and Directories ;

include_path = ; include path settings, UNIX : " /path1:/path2" Windows: " path1;path2"
doc_root = ; The root path of the php page, only valid when it is not empty
user_dir = ; Tell php to open the script using /~username Which directory to search for, only valid when it is not empty
;upload_tmp_dir =; Temporary directory to store files uploaded using HTTP protocol (use the system default if not specified)
upload_max_filesize = 2097152; File upload is limited by default For 2 Meg
extension_dir = c:php; The directory where loadable extension libraries (modules) are stored
enable_dl = On; Whether to enable dl().
; The dl() function *doesn't* work well on multi-threaded servers,
; such as IIS or Zeus, and is disabled by default on them

; File Uploads ;

file_uploads = On ; Whether to allow HTTP file uploads
;upload_tmp_dir = ; Temporary directory for HTTP uploaded files (used if not specified) System default)
upload_max_filesize = 2M; Maximum allowed size of uploaded files

; Fopen wrappers ;

allow_url_fopen = On ; Whether to allow URLs to be treated as http:.. or files as ftp:...

; Dynamic Extensions;
; Dynamic Extensions;

; If you want an extension library to be loaded automatically, use the following syntax:
; extension=modulename.extension
; For example, on Windows,
; extension=msql.dll
; or on UNIX,
; extension=msql.so
; Note that this should only be the name of the module , no directory information is required to be placed in it.
; Use the extension_dir above to indicate the location of the specified extension library.

;Windows extension
;extension=php_nsmail.dll
extension=php_calendar.dll
;extension=php_dbase.dll
;extension=php_filepro.dll
extension=php_gd .dll
;extension=php_dbm.dll
;extension=php_mssql.dll
;extension=php_zlib.dll
;extension=php_filepro.dll
;extension=php_imap4r2.dll
;extension=php_ldap.dll
;extension=php_crypt.dll
;extension=php_msql2.dll
;extension=php_odbc.dll
; Note that MySQL support is now built-in, therefore, No need to use its dll

; Module Settings ;
; Module Settings ;
;;;;;;;;;;;;;;;;;;;

[Syslog]
define_syslog_variables = Off ; Whether to define various system log variables
; Such as: $LOG_PID, $LOG_CRON, etc.
; Turning it off is a good idea to increase efficiency.
; At runtime, you can call the function define_syslog_variables() to define these variables

[mail function]
SMTP = localhost ; only for win32 systems
sendmail_from = me@localhost.com ; only for win32 systems
;sendmail_path = ;Only for unix, also supports parameters (default is 'sendmail -t -i')

[Debugger]
debugger.host = localhost
debugger.port = 7869
debugger.enabled = False

[Logging]
; These configurations indicate the logging mechanism used for the example.
; See examples/README.logging for more explanation
; logging.method = db
; logging.directory = /path/to/log/directory

[Java]
;java.class.path = .php_java.jar
;java.home = c:jdk
;java.library = c:jdkjrebinhotspotjvm.dll
;java.library.path = .

[SQL]
sql.safe_mode = Off

[ODBC]
;uodbc.default_db = Not yet implemented
;uodbc.default_user = Not yet implemented
;uodbc.default_pw = Not yet implemented
uodbc. allow_persistent = On ; Allow or disable persistent connections
uodbc.check_persistent = On ; Check whether the connection is still available before reusing it
uodbc.max_persistent = -1 ; The maximum number of persistent connections. -1 means unlimited
uodbc.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 represents unlimited
uodbc.defaultlrl = 4096; Controls LONG type fields. Returns the number of bytes of the variable, 0 means passthru (?) 0 means passthru
uodbc.defaultbinmode = 1; Control binary data. 0 represents Handling of binary data. 0 means passthru, 1 return as is, 2 convert to char
; See the documentation for odbc_binmode and odbc_longreadlen for explanations of uodbc.defaultlrl and uodbc.defaultbinmode.

[MySQL]
mysql.allow_persistent = On ; Allow or disable persistent connections
mysql.max_persistent = -1 ; The maximum number of persistent connections. -1 represents unlimited
mysql.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 represents unlimited
mysql.default_port = ; The default port used by mysql_connect(). If not set, mysql_connect()
; will use the variable $MYSQL_TCP_PORT, or the mysql-tcp entry under /etc/services (unix),
; or MYSQL_PORT defined during compilation (in this order)
; Win32 environment will only check MYSQL_PORT.
mysql.default_socket = ; The default socket name used for local MySql connections. If empty, use MYSQL built-in value

mysql.default_host = ; The host used by mysql_connect() by default (invalid in safe mode)
mysql.default_user = ; The user name used by mysql_connect() by default (invalid in safe mode)
mysql.default_password = ; Password used by mysql_connect() by default (invalid in safe mode)
; Note that saving passwords under this file is generally a *bad* idea
; *Any* user with PHP access can run
; 'echo cfg_get_var(" mysql.default_password" )' to display that password!
; And of course, any user with permission to read the file can also see that password.

[mSQL]
msql.allow_persistent = On ; Allow or disable persistent connections
msql.max_persistent = -1 ; Maximum number of persistent connections. -1 represents unlimited
msql.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 means unlimited

[PostgresSQL]
pgsql.allow_persistent = On ; Allow or disable persistent connections
pgsql.max_persistent = -1 ; The maximum number of persistent connections. -1 represents unlimited
pgsql.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 means unlimited

[Sybase]
sybase.allow_persistent = On ; Allow or disable persistent connections
sybase.max_persistent = -1 ; Maximum number of persistent connections. -1 represents unlimited
sybase.max_links = -1; The maximum number of connections (persistent and non-persistent). -1 represents unlimited
;sybase.interface_file = "/usr/sybase/interfaces"
sybase.min_error_severity = 10; The minimum severity of the displayed error
sybase.min_message_severity = 10; The minimum severity of the displayed message Minimum importance
sybase.compatability_mode = Off ; Mode compatible with older versions of PHP 3.0. If turned on, this will cause PHP to automatically
; assign them the Sybase type based on the results,
; instead of treating them all as strings.
; This compatibility mode will not remain available forever,
; Therefore, make the necessary changes to your code,
; and turn it off.

[Sybase-CT]
sybct.allow_persistent = On ; Allow or disable persistent connections
sybct.max_persistent = -1 ; Maximum number of persistent connections. -1 means unlimited
sybct.max_links = -1 ; Maximum number of connections (persistent and non-persistent). -1 means unlimited
sybct.min_server_severity = 10 ; Minimum severity of errors displayed
sybct.min_client_severity = 10 ; Minimum severity of messages displayed

[bcmath]
bcmath.scale = 0 ; number of decimal digits for all bcmath functions

[browscap]
;browscap = extra/browscap.ini
browscap = C:WINSYSTEMinetsrvbrowscap.ini
[Informix]
ifx.default_host = ; ifx_connect() Host used by default (invalid in safe mode)
ifx.default_user = ; ifx_connect() Username used by default (invalid in safe mode)
ifx.default_password = ; ifx_connect() Password used by default (safe mode Invalid below)
ifx.allow_persistent = On; Allow or disable persistent connections
ifx.max_persistent = -1; The maximum number of persistent connections. -1 represents unlimited
ifx.max_links = -1 ; Maximum number of connections (persistent and non-persistent). -1 represents unlimited
ifx.textasvarchar = 0 ; If turned on, the select status code returns the content of a 'text blob' field instead of its id
ifx.byteasvarchar = 0 ; If turned on, the select status code returns Returns the contents of a 'byte blob' field rather than its id
ifx.charasvarchar = 0 ; Tracks whitespace stripped from a fixed-length character column.
; May work for Informix SE users.
ifx.blobinfile = 0 ; If turned on, the contents of text and byte blobs are exported to a file
; instead of being saved to memory.
ifx.nullformat = 0 ; NULL (empty) is returned as a null field, unless it is set to 1 here.
; In this case (1), NULL is returned as the string NULL.

[Session]
session.save_handler = files; Control method for saving/retrieving data
session.save_path = C:wintemp; Passed when save_handler is set to a file Parameters of the controller,
; This is the path where the data file will be saved.
session.use_cookies = 1; Whether to use cookies
session.name = PHPSESSID
; The name of the session used in cookies
session.auto_start = 0; Initialize the session when the request starts
session.cookie_lifetime = 0 ; It is the cookie storage time in seconds,
; or when it is 0, until the browser is restarted
session.cookie_path = / ; The effective path of the cookie
session.cookie_domain = ; Valid domain of cookie
session.serialize_handler = php ; Controller used to connect data
; php is the standard controller of PHP.
session.gc_probability = 1 ; Probability in percent that the 'garbage collection' process
; will start each time the session is initialized.
session.gc_maxlifetime = 1440 ; After the number of seconds indicated by the number here, the saved data will be considered
; 'garbage' and cleaned up by the gc process.
session.referer_check = ; Check HTTP referrers to invalidate additional ids included in URLs
session.entropy_length = 0 ; How many bytes to read from the file
session.entropy_file = ; Specify here to create a session id
; session.entropy_length = 16
; session.entropy_file = /dev/urandom
session.cache_limiter = nocache ; Set to {nocache, private, public} to determine HTTP's
; cache Problem
session.cache_expire = 180; document expires after n minutes
session.use_trans_sid = 1; use transitional sid support, if enabled at compile time
; --enable-trans-sid
url_rewriter.tags = " a=href,area=href,frame=src,input=src,form=fakeentry"

[MSSQL]
;extension=php_mssql.dll
mssql.allow_persistent = On; Allow or disable persistent connections
mssql.max_persistent = -1; Maximum number of persistent connections . -1 represents unlimited
mssql.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 means unlimited
mssql.min_error_severity = 10 ; Minimum severity of errors displayed
mssql.min_message_severity = 10 ; Minimum severity of messages displayed
mssql.compatability_mode = Off ; Same as older versions of PHP 3.0 compatible mode.

[Assertion]
; ? ? ? ? ?
;assert.active = On; ? assert(expr); active by default
;assert.warning = On ; issue a PHP warning for each failed assertion.
;assert.bail = Off ; don't bail out by default.
;assert .callback = 0 ; user-function to be called if an assertion fails.
;assert.quiet_eval = 0 ; eval the expression with current error_reporting(). set to true if you want error_reporting(0) around the eval() .

[Ingres II]
ii.allow_persistent = On ; Allow or disable persistent connections
ii.max_persistent = -1 ; Maximum number of persistent connections. -1 means unlimited
ii.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 represents unlimited
ii.default_database = ; default database (format : [node_id::]dbname[/srv_class]
ii.default_user = ; default user
ii.default_password = ; default password

[Verisign Payflow Pro]
pfpro.defaulthost = " test.signio.com" ; Default Signio server
pfpro.defaultport = 443 ; Default port to connect to
pfpro .defaulttimeout = 30 ; Default timeout in seconds

; pfpro.proxyaddress = ; Default proxy IP address (if needed)
; pfpro.proxyport = ; Default proxy port
; pfpro.proxylogon = ; Default proxy login (logon user name)
; pfpro.proxypassword = ; Default proxy password

[Sockets]
sockets.use_system_read = On; Use the system's read() function instead of php_read() package
; Local Variables: (local variables)
; tab- width: 4
; End