Initially the problem was PHP files on my server were displayed as plain text(the whole code was shown). So I found out by investigating that the MIME type has to be added to the /etc/mime.types , so I did that and also restarted my server but that didn't help solve the issue so on further investigation, I found out from here that we needed php5 module enabled and on running the apachectl -M, I couldn't find the php5 module listed. So I tried installing it and this was the outcome of it :
admin@vm:~$ sudo apt-get install php5
...
php5_invoke pdo: already enabled for apache2 SAPI
dpkg: error processing package libapache2-mod-php5 (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
libapache2-mod-php5
E: Sub-process /usr/bin/dpkg returned an error code (1)
admin@vm:~$ sudo apt-get install libapache2-mod-php5
...
dpkg: error processing package libapache2-mod-php5 (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
libapache2-mod-php5
E: Sub-process /usr/bin/dpkg returned an error code (1)
I also need to mention that I created 2 virtual hosts for the sites. I am not sure what is wrong. Could some one help me on this?