7 easy steps:

For 64-bit system, download phantomjs-1.9.7-linux-x86_64.tar.bz2 (12.6 MB).
For 32-bit system, download phantomjs-1.9.7-linux-i686.tar.bz2 (12.9 MB).

Step 1> $ wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.7-linux-x86_64.tar.bz2

Step 2> $ tar -xvf phantomjs-1.9.7-linux-x86_64.tar.bz2

Step 3> $ cd phantomjs-1.9.7-linux-x86_64

Step 4> $ cd bin

Step 5> $ sudo cp phantomjs /usr/bin

To check phantomjs installed properly perform the following step : 

Step 6> $ phantomjs -h

To install the dependencies on Red Hat based systems:

Step 7> $ sudo yum install fontconfig freetype libfreetype.so.6 libfontconfig.so.1 libstdc++.so.6