Install php-yaml by entering the following commands in the terminal:
sudo apt update sudo apt install php-yaml
Description:
YAML-1.1 parser and emitter for PHP
PHP extension adding support for YAML 1.1 (YAML Ain't Markup Language) serialization using the LibYAML library.
Homepage: http://pecl.php.net/package/Yaml
Version: 2.0.0+1.3.0-2build2
Section: universe/php