An error occurs when starting a Laravel project. How to solve it?

Question

PHP

Dear experts! Symfony\Component\Debug\Exception\FatalThrowableError (E_ERROR)Call to undefined function Illuminate\Encryption\openssl_cipher_iv_length() error occurs when starting a Laravel project. How to solve it?

Answer 1

For the future - the text of the exception can be googled through copy-paste and you will get a lot of answers on how to solve it :)
Specifically, this problem is related to the fact that the openssl extension for php is not installed and / or configured. Look for instructions for your OS and server on how to install it.