在尝试了以上所有方法都没有效果之后，考虑重新启动你的电脑。解决了我的。

我发布这个答案是因为我的Virtualmin/Webmin管理界面决定禁用我的PHP引擎是一个好主意。我花了一段时间才找到解决方案，所以我想和你们分享一下:

同时，确保你的网站配置文件中没有任何与这个特定主机或虚拟主机相关的php_admin_value在它们中关闭PHP，就像这样:

php_admin_value engine Off

有疑问的时候，评论一下…

# php_admin_value engine Off

并重新启动您的web服务器。

我认为问题是，它显示的代码而不是结果是，它不会去本地主机。重新检查你要去的地址。是到本地文件目录还是到本地主机。

从你发送的屏幕截图，它将到你的计算机，而不是到本地主机。

"file:/// "应该是"localhost/"

你只是把php文件打开到浏览器。你必须使用localhost url打开它。如果您直接从目录中打开一个文件，在任何情况下它都不会执行PHP代码。

使用:http://locahost/index.php或http:127.0.0.1/index.php

启用php短代码。在本例中，您使用<?这是<? PHP的PHP短代码。默认情况下，php短代码是禁用的。

如果你是ubuntu用户，也可以使用:sudo apt-get install php5 libapache2-mod-php5 php5-mcrypt。

如果你有这样的配置:

<VirtualHost *:80>
    ServerName example.com
    DocumentRoot "/var/www/example.com"

    <FilesMatch "\.php$">
        SetHandler "proxy:fcgi://127.0.0.1:9000"
    </FilesMatch>
</VirtualHost>

取消httpd.conf中的下几行注释

LoadModule proxy_module lib/httpd/modules/mod_proxy.so
LoadModule proxy_fcgi_module lib/httpd/modules/mod_proxy_fcgi.so

这对我很有用

听起来你的配置好像有问题，下面是一些你可以检查的东西:

Make sure that PHP is installed and running correctly. This may sound silly, but you never know. An easy way to check is to run php -v from a command line and see if returns version information or any errors. Make sure that the PHP module is listed and uncommented inside of your Apache's httpd.conf This should be something like LoadModule php5_module "c:/php/php5apache2_2.dll" in the file. Search for LoadModule php, and make sure that there is no comment (;) in front of it. Make sure that Apache's httpd.conf file has the PHP MIME type in it. This should be something like AddType application/x-httpd-php .php. This tells Apache to run .php files as PHP. Search for AddType, and then make sure there is an entry for PHP, and that it is uncommented. Make sure your file has the .php extension on it, or whichever extension specified in the MIME definition in point #3, otherwise it will not be executed as PHP. Make sure you are not using short tags in the PHP file (<?), these are not enabled on all servers by default and their use is discouraged. Use <?php instead (or enable short tags in your php.ini with short_open_tag=On if you have code that relies on them). Make sure you are accessing your file over your webserver using an URL like http://localhost/file.php not via local file access file://localhost/www/file.php

最后，查看PHP手册以获得更多的设置技巧。