Argument lists for function declarations may be split across multiple lines

Function declarations

function funstuff_system(
  string $foo,
  string $bar,
  int $baz,
) {
  // body
}

Argument lists may be split across multiple lines, where each subsequent line is indented once.

When the argument list is split across multiple lines

• The first item in the list must be on the next line.
• There must be only one argument per line.
• The last argument in the list must use a trailing comma.
• The closing parenthesis and opening brace must be placed together on their own line with one space between them.