MacTutor History of Mathematics: Porphyry: A concise biography with references, and links to related thinkers.
Porphyry: A brief introduction to his life and ideas.
Porphyry: Short introduction to his life and works, from the Ecole Glossary.
The Life and Work of Porphyry: A short biographical study, with an emphasis on Porphyry's legacy to the vegan movement.