Problem/Motivation
With php-ds getting traction, both as native extension and polyfill, there is no performance excuse for sticking to arrays of doom. Moving away from php's arrays will also remove attack vectors, thus be good for security (remember Drupageddon?).
Efficient data structures for PHP 7 – Rudi Theunissen – Medium
php-ds/extension: An extension providing efficient data structures for PHP 7
Proposed resolution
Explore usage, use it whereever fits.
Remaining tasks
TBD
User interface changes
None
API changes
Some.
Data model changes
Arrays become other structures.