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The following is required to transfer a website from a hosting (cloud) or local server to BitrixVA or BitrixEnv virtual environment: site archive and configured BitrixVA or BitrixEnv Virtual Environment. This process consists of two stages:
Error "Call to undefined function mysqli_init()" can occur during the transition to a new version of BitrixVA/BitrixEnv platform. Reason: previously, .mysql extension was used in MySQL database (declared obsolete in PHP 5.5.0). Mysqli. extension is used in new versions.