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如何在php安装完成之后加入mysqli支持
1.修改php.ini 找到;extension=php_mysqli.dll，然后删掉前面的分号（有分号代表已经被注释掉）；2.也有可能并没有;extension=php_mysqli.dll这一行，那你就加上“extention=php_mysqli.dll”这一行（修改时不要加引号）;以上两种修改后，都要重启apache希望我的回答对你有所帮助。
php安装的问题，无法载入 mysql 扩展，请检查 PHP 配置
首先你需要将PHP安装目录下的php_mysql.dll和php_mysqli.dll（我的在D:\apptools\php5\ext目录下）复制到c:\windows\system32目录下，然后修改php.ini文件（需要放到c:\windows目录下），关键是extension=php_mysql.dll 和extension_dir = "D:/apptools/php5/ext"。 我的配置是这样的： ;;;;;;;;;;; ; WARNING ; ;;;;;;;;;;; ; This is the default settings file for new PHP installations. ; By default, PHP installs itself with a configuration suitable for ; development purposes, and *NOT* for production purposes. ; For several security-oriented considerations that should be taken ; before going online with your site, please consult php.ini-recommended ***隐藏网址***;;;;;;;;;;;;;;;;;;; ; About php.ini ; ;;;;;;;;;;;;;;;;;;; ; This file controls many aspects of PHP’s behavior. In order for PHP to ; read it, it must be named ’php.ini’. PHP looks for it in the current ; working directory, in the path designated by the environment variable ; PHPRC, and in the path that was defined in compile time (in that order). ; Under Windows, the compile-time path is the Windows directory. The ; path in which the php.ini file is looked for can be overridden using ; the -c argument in command line mode. ; ; The syntax of the file is extremely simple. Whitespace and Lines ; beginning with a semicolon are silently ignored (as you probably guessed). ; Section headers (e.g. ) are also silently ignored, even though ; they might mean something in the future. ; ; Directives are specified using the following syntax: ; directive = value ; Directive names are *case sensitive* - foo=bar is different from FOO=bar. ; ; The value can be a string, a number, a PHP constant (e.g. E_ALL or M_PI), one ; of the INI constants (On, Off, True, False, Yes, No and None) or an expression ; (e.g. E_ALL & ~E_NOTICE), or a quoted string ("foo"). ; ; Expressions in the INI file are limited to bitwise operators and parentheses: ; | bitwise OR ; & bitwise AND ; ~ bitwise NOT ; ! boolean NOT ; ; Boolean flags can be turned on using the values 1, On, True or Yes. ; They can be turned off using the values 0, Off, False or No. ; ; An empty string can be denoted by simply not writing anything after the equal ; sign, or by using the None keyword: ; ; foo = ; sets foo to an empty string ; foo = none ; sets foo to an empty string ; foo = "none" ; sets foo to the string ’none’ ; ; If you use constants in your value, and these constants belong to a ; dynamically loaded extension (either a PHP extension or a Zend extension), ; you may only use these constants *after* the line that loads the extension. ; ; ;;;;;;;;;;;;;;;;;;; ; About this file ; ;;;;;;;;;;;;;;;;;;; ; All the values in the php.ini-dist file correspond to the builtin ; defaults (that is, if no php.ini is used, or if you delete these lines, ; the builtin defaults will be identical). ;;;;;;;;;;;;;;;;;;;; ; Language Options ; ;;;;;;;;;;;;;;;;;;;; ; Enable the PHP scripting language engine under Apache. engine = On ; Enable compatibility mode with Zend Engine 1 (PHP 4.x) zend.ze1_compatibility_mode = Off ; Allow the 《? tag. Otherwise, only 《?php and 《script》 tags are recognized. ; NOTE: Using short tags should be avoided when developing applications or ; libraries that are meant for redistribution, or deployment on PHP ; servers which are not under your control, because short tags may not ; be supported on the target server. For portable, redistributable code, ; be sure not to use short tags. short_open_tag = On ; Allow ASP-style 《% %》 tags. asp_tags = Off ; The number of significant digits displayed in floating point numbers. precision = 12 ; Enforce year 2000 compliance (will cause problems with non-compliant browsers) y2k_compliance = On ; Output buffering allows you to send header lines (including cookies) even ; after you send body content, at the price of slowing PHP’s output layer a ; bit. You can enable output buffering during runtime by calling the output ; buffering functions. You can also enable output buffering for all files by ; setting this directive to On. If you wish to limit the size of the buffer ; to a certain size - you can use a maximum number of bytes instead of ’On’, as ; a value for this directive (e.g., output_buffering=4096). output_buffering = On ; You can redirect all of the output of your scripts to a function. For ; example, if you set output_handler to "mb_output_handler", character ; encoding will be transparently converted to the specified encoding. ; Setting any output handler automatically turns on output buffering. ; Note: People who wrote portable scripts should not depend on this ini ; directive. Instead, explicitly set the output handler using ob_start(). ; Using this ini directive may cause problems unless you know what script ; is doing. ; Note: You cannot use both "mb_output_handler" with "ob_iconv_handler" ; and you cannot use both "ob_gzhandler" and "zlib.output_compression". ; Note: output_handler must be empty if this is set ’On’ !!!! ; Instead you must use zlib.output_handler. ;output_handler = ; Transparent output compression using the zlib library ; Valid values for this option are ’off’, ’on’, or a specific buffer size ; to be used for compression (default is 4KB) ; Note: Resulting chunk size may vary due to nature of compression. PHP ; outputs chunks that are few hundreds bytes each as a result of ; compression. If you prefer a larger chunk size for better ; performance, enable output_buffering in addition. ; Note: You need to use zlib.output_handler instead of the standard ; output_handler, or otherwise the output will be corrupted. zlib.output_compression = Off ; You cannot specify additional output handlers if zlib.output_compression ; is activated here. This setting does the same as output_handler but in ; a different order. ;zlib.output_handler = ; Implicit flush tells PHP to tell the output layer to flush itself ; automatically after every output block. This is equivalent to calling the ; PHP function flush() after each and every call to print() or echo() and each ; and every HTML block. Turning this option on has serious performance ; implications and is generally recommended for debugging purposes only. implicit_flush = Off ; The unserialize callback function will be called (with the undefined class’ ; name as parameter), if the unserializer finds an undefined class ; which should be instantiated. ; A warning appears if the specified function is not defined, or if the ; function doesn’t include/implement the missing class. ; So only set this entry, if you really want to implement such a ; callback-function. unserialize_callback_func= ; When floats & doubles are serialized store serialize_precision significant ; digits after the floating point. The default value ensures that when floats ; are decoded with unserialize, the data will remain the same. serialize_precision = 100 ; Whether to enable the ability to force arguments to be passed by reference ; at function call time. This method is deprecated and is likely to be ; unsupported in future versions of PHP/Zend. The encouraged method of ; specifying which arguments should be passed by reference is in the function ; declaration. You’re encouraged to try and turn this option Off and make ; sure your scripts work properly with it in order to ensure they will work ; with future versions of the language (you will receive a warning each time ; you use this feature, and the argument will be passed by value instead of by ; reference). allow_call_time_pass_reference = On ; ; Safe Mode ; safe_mode = Off ; By default, Safe Mode does a UID compare check when ; opening files. If you want to relax this to a GID compare, ; then turn on safe_mode_gid. safe_mode_gid = Off ; When safe_mode is on, UID/GID checks are bypassed when ; including files from this directory and its subdirectories. ; (directory must also be in include_path or full path must ; be used when including) safe_mode_include_dir = ; When safe_mode is on, only executables located in the safe_mode_exec_dir ; will be allowed to be executed via the exec family of functions. safe_mode_exec_dir = ; Setting certain environment variables may be a potential security breach. ; This directive contains a comma-delimited list of prefixes. In Safe Mode, ; the user may only alter environment variables whose names begin with the ; prefixes supplied here. By default, users will only be able to set ; environment variables that begin with PHP_ (e.g. PHP_FOO=BAR). ; ; Note: If this directive is empty, PHP will let the user modify ANY ; environment variable! safe_mode_allowed_env_vars = PHP_ ; This directive contains a comma-delimited list of environment variables that ; the end user won’t be able to change using putenv(). These variables will be ; protected even if safe_mode_allowed_env_vars is set to allow to change them. safe_mode_protected_env_vars = LD_LIBRARY_PATH ; open_basedir, if set, limits all file operations to the defined directory ; and below. This directive makes most sense if used in a per-directory ; or per-virtualhost web server configuration file. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. ;open_basedir = ; This directive allows you to disable certain functions for security reasons. ; It receives a comma-delimited list of function names. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. disable_functions = ; This directive allows you to disable certain classes for security reasons. ; It receives a comma-delimited list of class names. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. disable_classes = ; Colors for Syntax Highlighting mode. Anything that’s acceptable in ; 《span style="color: ???????"》 would work. ;highlight.string = #DD0000 ;highlight.comment = #FF9900 ;highlight.keyword = #007700 ;highlight.bg = #FFFFFF ;highlight.default = #0000BB ;highlight.html = #000000 ; If enabled, the request will be allowed to complete even if the user aborts ; the request. Consider enabling it if executing long request, which may end up ; being interrupted by the user or a browser timing out. ; ignore_user_abort = On ; ; Misc ; ; Decides whether PHP may expose the fact that it is installed on the server ; (e.g. by adding its signature to the Web server header). It is no security ; threat in any way, but it makes it possible to determine whether you use PHP ; on your server or not. expose_php = On ;;;;;;;;;;;;;;;;;;; ; Resource Limits ; ;;;;;;;;;;;;;;;;;;; max_execution_time = 3000 ; Maximum execution time of each script, in seconds max_input_time = 60 ; Maximum amount of time each script may spend parsing request data memory_limit = 8M ; Maximum amount of memory a script may consume (8MB) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Error handling and logging ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; error_reporting is a bit-field. Or each number up to get desired error ; reporting level ; E_ALL - All errors and warnings (doesn’t include E_STRICT) ; E_ERROR - fatal run-time errors ; E_WARNING - run-time warnings (non-fatal errors) ; E_PARSE - compile-time parse errors ; E_NOTICE - run-time notices (these are warnings which often result ; from a bug in your code, but it’s possible that it was ; intentional (e.g., using an uninitialized variable and ; relying on the fact it’s automatically initialized to an ; empty string) ; E_STRICT - run-time notices, enable to have PHP suggest changes ; to your code which will ensure the best interoperability ; and forward compatibility of your code ; E_CORE_ERROR - fatal errors that occur during PHP’s initial startup ; E_CORE_WARNING - warnings (non-fatal errors) that occur during PHP’s ; initial startup ; E_COMPILE_ERROR - fatal compile-time errors ; E_COMPILE_WARNING - compile-time warnings (non-fatal errors) ; E_USER_ERROR - user-generated error message ; E_USER_WARNING - user-generated warning message ; E_USER_NOTICE - user-generated notice message ; ; Examples: ; ; - Show all errors, except for notices and coding standards warnings ; ;error_reporting = E_ALL & ~E_NOTICE ; ; - Show all errors, except for notices ; ;error_reporting = E_ALL & ~E_NOTICE | E_STRICT ; ; - Show only errors ; ;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; ; - Show all errors except for notices and coding standards warnings ; error_reporting = E_ALL & ~E_NOTICE ; Print out errors (as a part of the output). For production web sites, ; you’re strongly encouraged to turn this feature off, and use error logging ; instead (see below). Keeping display_errors enabled on a production web site ; may reveal security information to end users, such as file paths on your Web ; server, your database schema or other information. display_errors = On ; Even when display_errors is on, errors that occur during PHP’s startup ; sequence are not displayed. It’s strongly recommended to keep ; display_startup_errors off, except for when debugging. display_startup_errors = Off ; Log errors into a log file (server-specific log, stderr, or error_log (below)) ; As stated above, you’re strongly advised to use error logging in place of ; error displaying on production web sites. log_errors = Off ; Set maximum length of log_errors. In error_log information about the source is ; added. The default is 1024 and 0 allows to not apply any maximum length at all. log_errors_max_len = 1024 ; Do not log repeated messages. Repeated errors must occur in same file on same ; line until ignore_repeated_source is set true. ignore_repeated_errors = Off ; Ignore source of message when ignoring repeated messages. When this setting ; is On you will not log errors with repeated messages from different files or ; sourcelines. ignore_repeated_source = Off ; If this parameter is set to Off, then memory leaks will not be shown (on ; stdout or in the log). This has only effect in a debug compile, and if ; error reporting includes E_WARNING in the allowed list report_memleaks = On ; Store the last error/warning message in $php_errormsg (boolean). track_errors = Off ; Disable the inclusion of HTML tags in error messages. ; Note: Never use this feature for production boxes. ;html_errors = Off ; If html_errors is set On PHP produces clickable error messages that direct ; to a page describing the error or function causing the error in detail. ***隐藏网址***; and change docref_root to the base URL of your local copy including the ; leading ’/’. You must also specify the file extension being used including ; the dot. ; Note: Never use this feature for production boxes. ;docref_root = "/phpmanual/" ;docref_ext = .html ; String to output before an error message. ;error_prepend_string = "《font color=ff0000》" ; String to output after an error message. ;error_append_string = "《/font》" ; Log errors to specified file. ;error_log = filename ; Log errors to syslog (Event Log on NT, not valid in Windows 95). ;error_log = syslog ;;;;;;;;;;;;;;;;; ; Data Handling ; ;;;;;;;;;;;;;;;;; ; ; Note - track_vars is ALWAYS enabled as of PHP 4.0.3 ; The separator used in PHP generated URLs to separate arguments. ; Default is "&". ;arg_separator.output = "&" ; List of separator(s) used by PHP to parse input URLs into variables. ; Default is "&". ; NOTE: Every character in this directive is considered as separator! ;arg_separator.input = ";&" ; This directive describes the order in which PHP registers GET, POST, Cookie, ; Environment and Built-in variables (G, P, C, E & S respectively, often ; referred to as EGPCS or GPC). Registration is done from left to right, newer ; values override older values. variables_order = "EGPCS" ; Whether or not to register the EGPCS variables as global variables. You may ; want to turn this off if you don’t want to clutter your scripts’ global scope ; with user data. This makes most sense when coupled with track_vars - in which ; case you can access all of the GPC variables through the $HTTP_*_VARS, ; variables. ; ; You should do your best to write your scripts so that they do not require ; register_globals to be on; Using form variables as globals can easily lead ; to possible security problems, if the code is not very well thought of. register_globals = On ; Whether or not to register the old-style input arrays, HTTP_GET_VARS ; and friends. If you’re not using them, it’s recommended to turn them off, ; for performance reasons. register_long_arrays = On ; This directive tells PHP whether to declare the argv&argc variables (that ; would contain the GET information). If you don’t use these variables, you ; should turn it off for increased performance. register_argc_argv = On ; When enabled, the SERVER and ENV variables are created when they’re first ; used (Just In Time) instead of when the script starts. If these variables ; are not used within a script, having this directive on will result in a ; performance gain. The PHP directives register_globals, register_long_arrays, ; and register_argc_argv must be disabled for this directive to have any affect. auto_globals_jit = On ; Maximum size of POST data that PHP will accept. post_max_size = 8M ; Magic quotes ; ; Magic quotes for incoming GET/POST/Cookie data. magic_quotes_gpc = On ; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc. magic_quotes_runtime = Off ; Use Sybase-style magic quotes (escape ’ with ’’ instead of \’). magic_quotes_sybase = Off ; Automatically add files before or after any PHP document. auto_prepend_file = auto_append_file = ; As of 4.0b4, PHP always outputs a character encoding by default in ; the Content-type: header. To disable sending of the charset, simply ; set it to be empty. ; ; PHP’s built-in default is text/html default_mimetype = "text/html" ;default_charset = "iso-8859-1" ; Always populate the $HTTP_RAW_POST_DATA variable. ;always_populate_raw_post_data = On ;;;;;;;;;;;;;;;;;;;;;;;;; ; Paths and Directories ; ;;;;;;;;;;;;;;;;;;;;;;;;; ; UNIX: "/path1:/path3" ;include_path = ".:/php/includes" ; ; Windows: "\path1;\path3" include_path = ".;D:\apptools\php5\PEAR" ; The root of the PHP pages, used only if nonempty. ; if PHP was not compiled with FORCE_REDIRECT, you SHOULD set doc_root ; if you are running php as a CGI under any web server (other than IIS) ; see documentation for security issues. The alternate is to use the ; cgi.force_redirect configuration below doc_root = ; The directory under which PHP opens the script using /~username used only ; if nonempty. user_dir = ; Directory in which the loadable extensions (modules) reside. extension_dir = "D:/apptools/php5/ext" ; Whether or not to enable the dl() function. The dl() function does NOT work ; properly in multithreaded servers, such as IIS or Zeus, and is automatically ; disabled on them. enable_dl = On
