What are password encryption schemes that result in variable length common in MySQL and PHP?

I have stumbled across passwords on a MySQL database behind a PHP webapp. Here are some examples.
753a524d56b48d825328ce27
789e0ad30d15
7ba0868c23e0a2
d327e265ca2abcd7c
48276b3d5618850
bffaa9b3ba92ffc3
21614da133d56e72857c
44d2059e642f9733… Continue reading What are password encryption schemes that result in variable length common in MySQL and PHP?