How to enable php in apache on RHEL ?

1. In order to enable php engine in apache, you should make sure php is installed in the system first. Then refer following steps :

locate libphp5.so

In most of cases, libphp5.so will be present inside /etc/httpd/modules

2. Add following in httpd.conf :

------------------
# Use for PHP 5.x:
LoadModule php5_module modules/libphp5.so
AddHandler php5-script .php

# Add index.php to your DirectoryIndex line:
DirectoryIndex index.html index.php

AddType text/html .php

# PHP Syntax Coloring
# (optional but useful for reading PHP source for debugging):

AddType application/x-httpd-php-source phps
------------------

OR

-----------------

LoadModule php5_module modules/libphp5.so


# Use of the "ZTS" build with worker is experimental, and no shared
# modules are supported.
LoadModule php5_module modules/libphp5-zts.so


#
# Cause the PHP interpreter to handle files with a .php extension.
#
AddHandler php5-script .php
AddType text/html .php

#
# Add index.php to the list of files that will be served as directory
# indexes.
#
DirectoryIndex index.php

#
# Uncomment the following line to allow PHP to pretty-print .phps
# files as PHP source code:
#
#AddType application/x-httpd-php-source .phps
-----------------

3. Restart apache.

Testing :

$ httpd -t

Create a php file inside web directory. Put the following content in that file like :

vi info.php

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Then access the file through browser like http://localhost/info.php. If it shows all the enables php directives or modules then php works fine.