* echo "hello world display";
  * error_log("hello world to error log");

ways of escaping with strings, quotes, etc.:


  * https:%%//%%gist.github.com/jacobwalker0814/bba3aaca9ea0df6735ed

[[https://blog.programster.org/ubuntu-16-04-install-php7-2-from-ppa|Install php7.2, 7.3 on 16.04]]