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A comment on Ask HN: State of PHP at Facebook?. Parent comment
Specifically they used [2] 'partial mode' since "this loosens several restrictions to ease migration"
[1] https://slack.engineering/hacklang-at-slack-a-better-php/
[2] https://docs.hhvm.com/hack/source-code-fundamentals/program-...
EDIT: This would indicate that Hack may perhaps support standard PHP syntax but not the other way around.
EDIT: According to this [3] they are very compatible.
[3] https://www.oreilly.com/library/view/hack-and-hhvm/978149192...
[0]: https://hhvm.com/blog/2018/09/12/end-of-php-support-future-o...
Specifically they used [2] 'partial mode' since "this loosens several restrictions to ease migration"
[1] https://slack.engineering/hacklang-at-slack-a-better-php/
[2] https://docs.hhvm.com/hack/source-code-fundamentals/program-...
EDIT: This would indicate that Hack may perhaps support standard PHP syntax but not the other way around.
EDIT: According to this [3] they are very compatible.
[3] https://www.oreilly.com/library/view/hack-and-hhvm/978149192...