– Conclusion: don’t install alibabacloud/facebody-20191230 3.0.8 (conflict analysis result)
– alibabacloud/tea-oss-utils 0.2.0 requires ocramius/package-versions ^1.5 -> satisfiable by ocramius/package-versions[1.5.0, …, 1.11.0].
– ocramius/package-versions[1.5.0, …, 1.5.1] require php ^7.3.0 -> your php version (5.6.27) does not satisfy that requirement.
composer install --ignore-platform-reqs