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Reprinted from http://www.cnblogs.com/hbl/archive/2008/02/15/1069367.html
[PHP]
; PHP is still a constantly evolving tool, and its functions are still It is constantly being deleted
; And the setting changes of 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 ; guess). 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 = value
; directive = value
; directives are *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),
; one of the INI constants (On, Off, True, False, Yes, No and None), or An expression
; (eg: E_ALL & ~E_NOTICE), or a quoted string (" foo" ).
;
; Expressions in INI files are restricted to bitwise operators and parentheses.
; | bitwise OR
; & bitwise AND
; ~ bitwise NOT
; ! boolean NOT
;
; The Boolean flag is available as 1, On, True or Yes. These values ​​are turned on.
; 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 Empty string
; foo = " none" ; Set foo to the string 'none'
;
; If you use constants in value settings, and these constants belong to dynamically loaded extension libraries (not PHP extensions, that is
; Zend extensions), you can only use these constants *after* the lines that call in those extensions.
;
; All values ​​set in the php.ini-dist file are the same as the built-in defaults (this means that if php.ini
; is not used or you delete these lines, the default values ​​are the same as same).
;;;;;;;;;;;;;;;;;;;;;
; Language options;
;;;;;;;;;;;;;;;;;;;;
; engine = On ; Make the PHP scripting language engine (PHP scripting language engine) valid 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
y2k_compliance = Off ; Whether to turn on 2000 adaptation (may cause in non-Y2K compliant browsers question)
output_buffering = Off
; 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,
; that might 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. implicit_flush = Off
; Force flush (refresh) 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. allow_call_time_pass_reference = On
; 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 arbitrary environment variables! safe_mode_protected_env_vars = LD_LIBRARY_PATH
; This directive contains a comma-separated list of environment variables that end users will not be able to use putenv () fixed one.
; 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. ; 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
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 easier to check whether PHP is installed on your server. possible.
;;;;;;;;;;;;;;;;;;;
; Resource Limits = 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 handling and registration;
;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Error reporting is bitwise. Or add the numbers together 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 reminders (these are often It is caused by a bug in your code,
; or it may be caused by intentional behavior (such as using an uninitialized variable based on the fact that the uninitialized variable is automatically initialized to an
; empty string) ; 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 at compile time
; 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 ; Display all errors, In addition to reminders
; error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; Show only errors
error_reporting = E_ALL & ~E_NOTICE ; Show all errors except reminders
display_errors = On ; Display error messages (as part of the output)
; In final release On your web site, it is strongly recommended that you turn off this feature and use
; error logging instead (see below).
; Continuing to enable display_errors on the final published web site may
; expose some security-related information, such as your File paths on the 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 recommended to keep display_startup_errors turned off,
; except during error correction.
log_errors = Off ; log errors in a log file (server-specific log, stderr standard error output, or error_log (below))
; as explained above. In that case, it is strongly recommended that you log errors on the final published website
; 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 the error message
;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; When using '+' for characters Warning when crossing
;;;;;;;;;;;;;;;;;;
; Data Handling ;
;;;;;;;;;;;;;;;;;
variables_order = " EGPCS" ; This directive describes the order in which PHP records
; GET, POST, Cookie, Environment and Built-in variables.
; (represented by G, P, C, E & S, usually referenced by EGPCS or GPC).
; Record from left to right, new value replaces old value.
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 the argv and argc variables ; (Note: here argv is an array and argc is the number of variables)
; (which contains the 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, where * is replaced with ; ENV, POST, GET, COOKIE or SERVER when used
post_max_size = 8M ; The maximum size of POST data that PHP will accept.

gpc_order = "GPC" ; This order was objected. Use variables_order instead. ; Magic quotes
magic_quotes_gpc = On ; Use magic quotes in the input GET/POST/Cookie data
; (This is the original text, haha, the so-called magic quotes should refer to using escape characters to add reference control characters , such as '....)
magic_quotes_runtime= Off ; Use magic quotes for data generated during runtime,
; For example: data obtained through SQL query, data obtained using the exec() function, etc.
magic_quotes_sybase = Off ; Use Sybase style magic references (use 'extract' instead of ') ; Automatically add files before and after PHP documentation
auto_prepend_file =
auto_append_file =; Like 4.04b4, PHP always defaults to "Content" -type:" The header outputs the encoding of a character.
; Disables the output character set as long as it is set to empty.
; PHP's built-in default value 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 which directory to look for when opening the script using /~username. Only valid when non-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 to 2 Meg by default
extension_dir = c:php ; Directory to store loadable expansion libraries (modules)
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 upload
;upload_tmp_dir = ; Temporary directory for HTTP uploaded files (If not specified, the system default is used)
upload_max_filesize = 2M; The maximum allowed size of uploaded files; Fopen wrappers;
;;;;;;;;;;;;;;;;;;;
allow_url_fopen = On; Whether Allows treating URLs as http:.. or files as ftp:...
;;;;;;;;;;;;;;;;;;;;;;;;
; Dynamic expansion;
; 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 needed inside.
; Use the extension_dir above to indicate the location of the specified extension library. Extension=php_nsmail.dll extension=php_msql.dll ;extension=php_zlib.dll c .dll ; Note that MySQL support is now built-in, therefore, there is 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.
; When running, 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
;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 alive before reuse Available
uodbc.max_persistent = -1 ; 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 an explanation 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 is defined during compilation (in this order)
; In Win32 environment, only MYSQL_PORT will be checked.
mysql.default_socket = ; The default socket name used for local MySql connections. If empty, use the built-in value of MYSQL 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 = ; The default password used by mysql_connect() (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 ; The 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 means unlimited
pgsql.max_links = -1 ; Maximum number of connections (persistent and non-persistent). -1 represents unlimited [Sybase]
sybase.allow_persistent = On ; Allow or disable persistent connections
sybase.max_persistent = -1 ; The maximum number of persistent connections. -1 represents unlimited
sybase.max_links = -1 ; The maximum number of connections (persistent and non-persistent). -1 means unlimited
;sybase.interface_file = "/usr/sybase/interfaces"
sybase.min_error_severity = 10; Minimum severity of errors displayed
sybase.min_message_severity = 10; Minimum severity of messages displayed
sybase. compatability_mode = Off ; Compatibility mode 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,
; rather than treating them all as strings.
; This compatibility mode won't last forever,
; so 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 ; The 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 ; Used for all bcmath functions number of decimal digits for all bcmath functions[browscap]
;browscap = extra/browscap.ini
browscap = C:WINSYSTEMinetsrvbrowscap.ini
[Informix]
ifx.default_host = ; ifx_connect( ) The host used by default (invalid in safe mode)
ifx.default_user = ; ifx_connect() The user name used by default (invalid in safe mode)
ifx.default_password = ; ifx_connect() The default password used (invalid in safe mode)
ifx.allow_persistent = On ; Allow or disable persistent connections
ifx.max_persistent = -1 ; Maximum number of persistent connections. -1 means 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 a ' byte blob' field's contents, not 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
; rather than saved to memory.
ifx.nullformat = 0 ; NULL (empty) is returned as an empty 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; Parameters passed to the controller when save_handler is set to a file,
; This is the data file will The path to save.
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 is started
session.cookie_lifetime = 0 ; Record in seconds The cookie storage time,
; or 0, until the browser is restarted
session.cookie_path = / ; The valid path of the cookie
session.cookie_domain = ; The valid domain of the cookie
session.serialize_handler = php ; Used to connect data The controller
; php is the standard controller for PHP.
session.gc_probability = 1 ; Probability in percent that the 'garbage collection' process
; will be started on each session initialization.
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.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 ; Mode compatible with older versions of PHP 3.0.

[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 ; The maximum number of persistent connections. -1 means unlimited ii.max_links = -1 ; 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 required)
; pfpro.proxyport = ; Default proxy port
; pfpro.proxylogon = ; Default proxy login (logon username) ; pfpro.proxypassword = ; Default proxy password
[Sockets]
sockets.use_system_read = On; Use the system's read() function instead of the php_read() package
; Local Variables: (local variables) ; tab-width: 4 ; End

The above has introduced phpini, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.