windows下面，PHP如何启动一些扩展功能

我今天在试这个时，发现php有些默认设置，是需要人为介入修改的。

比如，当我们在安装一个软件，而这个软件需要启用php一些扩展功能。

那么，按一般套路，将php.ini文件里的相关行的注释去掉即可。

;;;;;;;;;;;;;;;;;;;;;;
; Dynamic Extensions ;
;;;;;;;;;;;;;;;;;;;;;;

; If you wish to have an extension loaded automatically, use the following
; syntax:
;
;   extension=modulename
;
; For example:
;
;   extension=mysqli
;
; When the extension library to load is not located in the default extension
; directory, You may specify an absolute path to the library file:
;
;   extension=/path/to/extension/mysqli.so
;
; Note : The syntax used in previous PHP versions ('extension=<ext>.so' and
; 'extension='php_<ext>.dll') is supported for legacy reasons and may be
; deprecated in a future PHP major version. So, when it is possible, please
; move to the new ('extension=<ext>) syntax.
;
; Notes for Windows environments :
;
; - Many DLL files are located in the extensions/ (PHP 4) or ext/ (PHP 5+)
;   extension folders as well as the separate PECL DLL download (PHP 5+).
;   Be sure to appropriately set the extension_dir directive.
;
;extension=bz2
extension=curl
;extension=fileinfo
extension=gd2
;extension=gettext
;extension=gmp
;extension=intl
;extension=imap
;extension=interbase
;extension=ldap
;extension=mbstring
;extension=exif      ; Must be after mbstring as it depends on it
extension=mysqli
;extension=oci8_12c  ; Use with Oracle Database 12c Instant Client
;extension=odbc
extension=openssl
;extension=pdo_firebird
extension=pdo_mysql
;extension=pdo_oci
;extension=pdo_odbc
;extension=pdo_pgsql
;extension=pdo_sqlite
;extension=pgsql
;extension=shmop

; The MIBS data available in the PHP distribution must be installed.
; See http://www.php.net/manual/en/snmp.installation.php
;extension=snmp

;extension=soap
;extension=sockets
;extension=sqlite3
;extension=tidy
;extension=xmlrpc
;extension=xsl

但，如果只是改这些的话，在windows环境，重启Php会看到这些warn，表示启用未生效。

so，看来php.ini里有默认的php扩展，如果不定义，在windows环境里，会到c:\php\ext目录下面去找。那么，肿么办？

自己改改呗，还是php.ini文件。

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

; UNIX: "/path1:/path2"
;include_path = ".:/php/includes"
;
; Windows: "\path1;\path2"
;include_path = ".;c:\php\includes"
;
; PHP's default setting for include_path is ".;/path/to/php/pear"
; http://php.net/include-path

; 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
; http://php.net/doc-root
doc_root =

; The directory under which PHP opens the script using /~username used only
; if nonempty.
; http://php.net/user-dir
user_dir =

; Directory in which the loadable extensions (modules) reside.
; http://php.net/extension-dir
; extension_dir = "./"
; On windows:
extension_dir = "d:\php72\ext"

; Directory where the temporary files should be placed.
; Defaults to the system default (see sys_get_temp_dir)
; sys_temp_dir = "/tmp"

然后，就没有然后啦。