1.停止WAMP服务器.

2.下载要安装的PHP版本。下载Window版本的ZIP包啦：http://php.net/downloads.php。解压到 Wamp的安装目录C:\wamp64\bin\php\php7.2.1

3.从已存在的php版本文件中(如phpphp7.1.9 (C:\wamp64\bin\php\php7.1.9)复制以下文件: - php.ini、phpForApache.ini和wampserver.conf到php7.2.1文件夹.

4.打开php7.2.1文件夹的以下文件: - php.ini和phpForApache.ini并且把其中所有的php7.1.9替换为php7.2.1。

5.修改Wamp配置文件：进入 Wamp的安装目录，用IDE或记事本(最好使用行号定位的记事本，如EditPlus等)打开 wampmanager.ini，查询switchPhp7.1.9。

复制：Type: item; Caption: "7.1.9"; Action: multi; Actions:switchPhp7.1.9

插入一行：Type: item; Caption: "7.2.1"; Action: multi; Actions:switchPhp7.2.1

复制：

[switchPhp7.1.9]

Action: service; Service: wampapache64; ServiceAction: stop; Flags: ignoreerrors waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php-win.exe";Parameters: "switchPhpVersion.php 7.1.9";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php.exe";Parameters: "switchMysqlPort.php 3306";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php-win.exe";Parameters: "refresh.php";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "net"; Parameters: "start wampapache64"; ShowCmd: hidden; Flags: waituntilterminated

Action: resetservices

Action: readconfig;

复制插入这行：

[switchPhp7.2.1]

Action: service; Service: wampapache64; ServiceAction: stop; Flags: ignoreerrors waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php-win.exe";Parameters: "switchPhpVersion.php 7.2.1";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php.exe";Parameters: "switchMysqlPort.php 3306";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "c:/wamp64/bin/php/php5.6.31/php-win.exe";Parameters: "refresh.php";WorkingDir: "c:/wamp64/scripts"; Flags: waituntilterminated

Action: run; FileName: "net"; Parameters: "start wampapache64"; ShowCmd: hidden; Flags: waituntilterminated

Action: resetservices

Action: readconfig;

6. 去C:\wamp64\bin\apache\apache2.4.27\bin删除php.ini文件。

7..重启wamp.

8.选择php7.2.1版本，选择后后会重启wamp。

9.可以打开phpinfo察看此时是否有php7.2.1的信息，然后打开Phpmyadmin,看是否可以访问。

10.完成。