As you have asked about the comparison between Professional in Human Resources -- the PHR -- and a Master of Business Administration -- the MBA course, I am giving you information about it, check below for the details

The PHR is a particular certificate program that prepares students to take a certification exam in human resources.
The MBA program is a two-year professional degree program in business and management that offers students an opportunity to specialize in human resources.

PHR Overview

PHR programs are offered by many universities and independent institutes
The PHR is useful for students who are trying to advance their careers in human resources management.
Prospective applicants without a bachelor’s degree typically must have four years, those with a bachelor's degree must have two years and those with a master's degree or higher need one year of demonstrated professional human resources experience.
Requirements and classes vary across PHR certificate programs
The length and the format of courses also tend to vary to make the programs available to the largest number of people. Some universities offer intensive 12-week in-class courses, while others operate entirely online

MBA is a broad professional degree in business, management, leadership and administration.
Some MBA programs offer students concentrations and electives in human resources, but no programs exclusively offer specific preparation for a particular exam.

Most MBA programs, whether traditional, part-time or online, require two years of coursework.
During the first year, students take a variety of foundational courses
During the second year, they take electives in their chosen area of concentration to acquire more experience in a specific area.