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
44d2059e642f97333
Apparently they are of different length each, so I would conclude that they are not hashed.
Another thing that strikes me is the seeming overrepresentation of numerals.
One can also observe the same symbol twice in a row fairly often.
Additionally they are mostly within the range of common password lengths.
I have tried cracking …

cybersecurity database encryption length mysql password passwords php result variable webapp