PHP is designed "to solve the Web problems",

http://www.blisswebsolution.com/php-mysql-website-development-and-designing-services-company.html 
PHP is designed "to solve the Web problems", and it is no surprise that most of the CMSs are written in PHP. PHP is easy to learn and is powerful software.  It allows building solid frameworks with elegant business logic.
Finding the best CMS to create innovative software products, websites, blogs, communities, e-commerce sites and intranets is daunting because we don’t want to make mistake  in terms of cost or features.
The most important thing is to evaluate options of a CMS software based on genre of your project so that you select “out-of-the-box” product needing less customization.
Depending on purpose and nature of business, specific CMS can deliver better.
It can be
  • Portal vs General Purpose
  • Blog CMS
  • eCommerce CMS
  • Wiki CMS
  • Forum CMS
  • eLearning CMS
  • Collaboration CMS
  • Photo gallery CMS

Therefore when making selection, make sure to go for one that posses good code and you can rest assured.
 


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