7 – Find which views are using Views PHP

Searching the views table directly seems to be best approach:

SELECT
  v.vid,
  v.name,
  d.display_title
FROM
  views_display d
JOIN
  views_view v
USING
  (vid)
WHERE
  d.display_options LIKE '%<?php%'
ORDER BY v.name;
+-----+----------------------------------------------+-------------------------------+
| vid | name                                         | display_title                 |
+-----+----------------------------------------------+-------------------------------+
| ID  | VIEW MACHINE NAME                            | VIEW DISPLAY NAME             |
+-----+----------------------------------------------+-------------------------------+