runtime php syntax check without saving file

.vimrc

  set errorformat=%m\ in\ %f\ on\ line\ %l
  if !exists('*PHPsynCHK')
    function! PHPsynCHK()
      ccl
      let winnum = winnr()
      let linenum = line('.')
      let colnum = col('.')
      silent execute "%!php -l -f /dev/stdin | sed 's/\\/dev\\/stdin/".bufname("%")."/g' >.vimerr; cat"
      silent cf .vimerr
      cw
      execute winnum . "wincmd w"
      silent undo
      silent cf
      if 1 == len(getqflist())
         call cursor(linenum, colnum)
      endif
    endfunction
  endif