此问题的另一个可能原因可能是您试图在UserDir模块的“用户目录”中运行脚本。在用户目录下运行PHP脚本默认是禁用的。如果脚本位于主文件夹的public_html目录中，并且您试图从http://localhost/~your_username访问它，那么就会遇到这个问题。

要解决这个问题，打开/etc/apache2/mods-enabled/php7.2.conf。必须注释或删除底部的标记块

<IfModule mod_userdir.c>
    <Directory /home/*/public_html>
        php_admin_flag engine Off
    </Directory>
</IfModule>

刚刚花了几个小时试图让PHP 5与Windows 10上的Apache 2.4一起运行。最后对我来说，这是httpd.conf LoadModule中的一个拼写错误。通过denny2018这个apachelounge线程的最后一个回答，提请注意写作和准确的模块路径。谢谢你！

过了两晚，我发现……我的目录是c:(小写)

我有LoadModule php5_module“c:/php/php5apache2.dll”，但正确的apache 2.4是:

LoadModule php5_module "C:/php/php5apache2_4.dll"

所以我之前也错过了_4(对于apache 2.4)。对我有用的完整片段:

# PHP
LoadModule php5_module "C:/php/php5apache2_4.dll"
AddHandler application/x-httpd-php .php
<FilesMatch \.php$>
    SetHandler application/x-httpd-php
</FilesMatch>

刚试过PHP 7。在Apache 2.4的httpd.conf中读取LoadModule行

LoadModule php7_module "C:/php/php7apache2_4.dll"

目前php手册显示c:/php/php5apache2.dll，当然需要调整。

在我的情况下(Apache/2.4.34)，

在取消特定模块的注释之后

其它选项:

from

“/etc/apache2/httpd.conf”

我的问题消失了。

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

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。

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