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what does vendor/autoload.php

vendor/autoload.php
#This file is used for autoloading libraries for the PHP project.

vendor/autoload.php download

# Create composer.json by initializing composer by:
composer init
# Create vendor/autoload.php by:
composer install

# Make sure you installed composer, if you haven't use:
sudo apt install composer # Linux
# For a other OS visit: https://getcomposer.org/download/