我有一个案例，我不小心开始解压我的文件目录在根。它从我的文件文件夹中添加了。htaccess文件，这将阻止所有php

# If we know how to do it safely, disable the PHP engine entirely.
<IfModule mod_php5.c>
  php_flag engine off
</IfModule>

底线检查根目录下的.htaccess文件。

在我的情况下，php模块没有加载。试试这个:

检查加载了哪些模块:apache2ctl -M。查找类似php7_module (shared)的模块 如果没有列出php模块，则尝试加载与您的php版本对应的模块。在我的例子中，php包是libapache2-mod-php7.3。所以我这样做了:a2enmod php7.3，问题就解决了。

我知道这听起来很傻……但这种情况很少发生。

检查您是否试图从

**http://localhost/info.php**

而不是来自

file:///var/www/info.php

Ps >你可以注意到如果你从shell写

php info.php 

它回答的代码(它意味着PHP函数)..

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。

在我的ubuntu 14.04, apache 2.4, php 5.5.9安装，我尝试在/var/www/html(默认文档根)上使用sample.php，它工作正常。 所以问题出在我的虚拟服务器配置上。 解决方案是在包含.php的Directory def中包含这一行:

    php_admin_flag engine on

php7.3。你可以尝试安装这些模块。这对我很管用。

sudo apt-get install libapache2-mod-php7.3

sudo service apache2 restart