See upstream issue: squizlabs/PHP_CodeSniffer#2523

Relevant commits which need to be emulated & made backward compatible (in as far possible):

• squizlabs/PHP_CodeSniffer@b74e813 (File::getMethodParameters() + associated tests)
• squizlabs/PHP_CodeSniffer@c8fca56 (File::getMethodProperties() + associated tests)
• squizlabs/PHP_CodeSniffer@37dda44 (File::getDeclarationName() + new tests needed)
• squizlabs/PHP_CodeSniffer@96e69bb (File::isReference() + associated tests)
• squizlabs/PHP_CodeSniffer@bbd6f63 (File::getMethodProperties())
• squizlabs/PHP_CodeSniffer@bf642b2 (File::findEndOfStatement() + associated tests)

The upstream changes are expected to be released in PHPCS 3.5.3.

Upstream will probably also contain a $functionKeyword token array (not yet implemented).