PHP syntax highlighting incorrectly matches keywords at the end of function names

The PHP syntax highlighting was incorrectly matching keywords when they appeared at the end of a function name. For example, when displaying "trigger_error(…)", the "or" at the end of the function name was highlighted as a keyword.

I've fixed this in our syntax highlighting by adding
b to the beginning of the regexp as well as the end:

/\b(abstract|and|array|as|break|case|catch|cfunction|class|clone|const|continue|declare|default|do|else|elseif|enddeclare|endfor|endforeach|endif|endswitch|endwhile|extends|final|for|foreach|function|global|goto|if|implements|interface|instanceof|namespace|new|old_function|or|private|protected|public|static|switch|throw|try|use|var|while|xor|_CLASS|DIR|FILE|FUNCTION|METHOD|NAMESPACE_|die|exit|eval|include|include_once|require|require_once|return)\b/