upgrade php5.6 -> php7.2

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brew tap homebrew/core
brew unlink php56
brew install php72

## 安装后提示
To enable PHP in Apache add the following to httpd.conf and restart Apache:
    LoadModule php7_module /usr/local/opt/php/lib/httpd/modules/libphp7.so

    <FilesMatch \.php$>
        SetHandler application/x-httpd-php
    </FilesMatch>

Finally, check DirectoryIndex includes index.php
    DirectoryIndex index.php index.html

The php.ini and php-fpm.ini file can be found in:
    /usr/local/etc/php/7.2/

To have launchd start php now and restart at login:
  brew services start php
Or, if you don't want/need a background service you can just run:
  php-fpm

启动 php-fpm

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brew services start php