$ sudo apt-get update
$ sudo apt-get install kdevelop-php-docs 

kdevelop-php-docs is installed in your system.

Make ensure the kdevelop-php-docs package were installed using the commands given below,

$ sudo dpkg-query -l | grep kdevelop-php-docs *

You will get with kdevelop-php-docs package name, version, architecture and description in a table

kdevelop-php-docs package basic information: