https://docs.hhvm.com/hack/readonly/explicit-readonly-keywords/
Explicit Readonly Keywords | Hack & HHVM Documentation
There are a few places where an explicit readonly keyword is required when using readonly values.
explicitreadonlykeywordshackhhvm
https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/SHA7Z7PRBILOGM5WGAQHZAVDM3DNFX42/
HHVM vs. Zend divergence - Wikitech-l - lists.wikimedia.org
hhvmvszenddivergencewikitech
https://pentest-tools.com/vulnerabilities-exploits/hhvm-multiple-vulnerabilities-sep19_4707
HHVM Multiple Vulnerabilities (Sep 2019) (CVE-2019-11925, CVE-2019-11926) - Vulnerability & Exploit...
HHMV is prone to multiple memory overflow vulnerabilities..
multiple vulnerabilitieshhvmsepcvevulnerability
https://planetozh.com/tweets/7123
@rmccue did you install hhvm locally, or completely relying on travis testing? | Ozh' Tweets
installhhvmlocallycompletelyrelying
https://idroot.us/tag/hhvm/
HHVM Archives - idroot
hhvmarchives
https://www.mediawiki.org/wiki/HHVM/About/nl
HHVM/Over - MediaWiki
hhvmmediawiki