@jlrdw Maybe here http://php.net/manual/en/migration70.new-features.php Just found what you may be looking for. It's kind of like the JS spread operator.
In PHP 5.6 and later, argument lists may include the ... token to denote that the function accepts a variable number of arguments. The arguments will be passed into the given variable as an array;
http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration