It seems that there are few conflicts when using https://roots.io/bedrock/ with roots/wp-password-bcrypt which declares its own variants of some funtions:

• wp_set_password
• wp_generate_password
• wp_check_password
• wp_hash_password

Running vendor/bin/phpstan analyze throws:

$ vendor/bin/phpstan analyze
Note: Using configuration file /var/www/example.com/phpstan.neon.
Fatal error: Cannot redeclare wp_hash_password() (previously declared in /var/www/example.com/vendor/roots/wp-password-bcrypt/wp-password-bcrypt.php:52) in /var/www/example.com/vendor/php-stubs/wordpress-stubs/wordpress-stubs.php on line 105420

Steps to reproduce

# Install roots/bedrock
composer create-project roots/bedrock
cd bedrock
# Create some dummy plugin to test
mkdir -p web/app/plugins/test/
touch web/app/plugins/test/test.php
# Run phpstan
vendor/bin/phpstan analyze web/app/plugins/test/
[...]
Fatal error: Cannot redeclare wp_hash_password() (previously declared in /var/www/example.com/bedrock/vendor/roots/wp-password-bcrypt/wp-password-bcrypt.php:52) in /var/www/example.com/bedrock/vendor/php-stubs/wordpress-stubs/wordpress-stubs.php on line 105420

Workaround

As bad as this is - I just comment out these four functions mentioned above from vendor/php-stubs/wordpress-stubs/wordpress-stubs.php