Fixes #8. Improved handling of ( ) and [ ] folds.

Turns out Vim assumes the fold of a '=' line following a '<#' line is 1 less than the #, rather than that of the line before the '>#' line, i.e. the last known line.

Author: swekaj

ftplugin/php/foldexpr.vim

@@ -134,10 +134,10 @@ function! GetPhpFold(lnum)
             " But don't start a fold if we're grouping if/elseif/else and try/catch
             return IndentLevel(a:lnum)+1
         else
-            return '>' . (IndentLevel(a:lnum)+1)
+            return 'a1'
         endif
-    elseif line =~? '\v^\s*[\(\[]*(\)|\])'
-        return '<' . (IndentLevel(a:lnum)+1)
+    elseif line =~? '\v^\s*([\(\[].*)@!(\)|\])'
+        return 's1'
     endif
 
     " Fold switch case and default blocks together