PHP auto syntax check (*nix only). Pre-writing file into /tmp directory because current dir may be remote mounted and writing can be very slow.

php-auto-syntax-check.vim

if !exists('*PHPsynCHK')
  function! PHPsynCHK()
    ccl
    let winnum = winnr() " get current window number
    let linenum = line('.')
    let colnum = col('.')
    "silent execute "%!php -l -f /dev/stdin | sed 's@\\/dev\\/stdin@".bufname("%")."@g' >/tmp/vimerr; cat"
    let tmp_file = '/tmp/vim_tmp.php'
    silent execute "w! " . tmp_file
    silent execute "!php -l -f '" . tmp_file . "' 2>&1 | sed 's\\#" . tmp_file . "\\#".bufname("%")."\\#g' >/tmp/vimerr"
    set errorformat=%m\ in\ %f\ on\ line\ %l
    silent cf /tmp/vimerr
    cw " open the error window if it contains error
    " return to the window with cursor set on the line of the first error (if any)
    execute winnum . "wincmd w"
    "silent undo
    silent cf
    if 1 == len(getqflist())
      w
      call cursor(linenum, colnum)
    endif
  endfunction
endif

au! BufWriteCmd  *.php    call PHPsynCHK()