installation-bundle/src/Config/ParameterDumper.php
public function dump(): void
    {
        if (
            empty($this->parameters['parameters']['secret']) ||
            'ThisTokenIsNotSoSecretChangeIt' === $this->parameters['parameters']['secret']
        ) {
            $this->parameters['parameters']['secret'] = bin2hex(random_bytes(32));
        }

        if (isset($this->parameters['parameters']['database_port'])) {
            $this->parameters['parameters']['database_port'] = (int) $this->parameters['parameters']['database_port'];
        }

        $this->filesystem->dumpFile(
            $this->rootDir.'/app/config/parameters.yml',
            "# This file has been auto-generated during installation\n".Yaml::dump($this->getEscapedValues())
        );
    }
public function dump(): void
    {
        if (
            empty($this->parameters['parameters']['secret']) ||
            'ThisTokenIsNotSoSecretChangeIt' === $this->parameters['parameters']['secret']
        ) {
            $this->parameters['parameters']['secret'] = bin2hex(random_bytes(32));
        }

        if (isset($this->parameters['parameters']['database_port'])) {
            $this->parameters['parameters']['database_port'] = (int) $this->parameters['parameters']['database_port'];
        }

        $this->filesystem->dumpFile(
            $this->rootDir.'/app/config/parameters.yml',
            "# This file has been auto-generated during installation\n".Yaml::dump($this->getEscapedValues())
        );
    }
Dumps the parameters into the parameters.yml file.