When switching localhost php versions for testing, nothing interrupts the workflow more than phpMyAdmin failing because you’re on php 5.4.
The single line of code, to be your
/phpmyadmin/ simply routes you to either the
phpmyadmin/new/ (v4.7 – supports php 5.5-7.2) and
phpmyadmin/old/ (4.0 – supporting php 5.2 – 5.4):