Yuriy Belenko 1d648223e6
[php] Set PHP version to 7.3 (#9986)
* Remove 7.2 from TravisCI config

* Bump Composer PHP requirement

* Bump PHP version in docblocks

* Add PHP 8 notice to readme

* Refresh samples
2021-07-20 21:06:50 +08:00
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2021-07-20 21:06:50 +08:00