PHPize.online is a free online environment for quickly running, experimenting with and sharing PHP (including Carbon extension for DateTime) and SQL code.
You can run your SQL code on top of most popular RDBMS, and run PHP code that can use the same DB.
For database manipulations you can use pre-defined instanses of PDO ($pdo), mysqli ($mysqli) & Laravel query builder ($db)
If you want to share your code snippets written here just share the page link.