diff --git a/autoload/airline/extensions/whitespace.vim b/autoload/airline/extensions/whitespace.vim
index c2535809..41949929 100644
--- a/autoload/airline/extensions/whitespace.vim
+++ b/autoload/airline/extensions/whitespace.vim
@@ -13,12 +13,9 @@ let s:long_format = get(g:, 'airline#extensions#whitespace#long_format', 'long[%
 let s:mixed_indent_file_format = get(g:, 'airline#extensions#whitespace#mixed_indent_file_format', 'mix-indent-file[%s]')
 let s:indent_algo = get(g:, 'airline#extensions#whitespace#mixed_indent_algo', 0)
 let s:skip_check_ft = {'make': ['indent', 'mixed-indent-file'] }
-
 let s:max_lines = get(g:, 'airline#extensions#whitespace#max_lines', 20000)
-
 let s:enabled = get(g:, 'airline#extensions#whitespace#enabled', 1)
-
-let s:c_like_langs = ['c', 'cpp', 'cuda', 'java', 'javascript', 'ld']
+let s:c_like_langs = get(g:, 'airline#extensions#c_like_langs', [ 'c', 'cpp', 'cuda', 'javascript', 'ld', 'php' ])
 
 function! s:check_mixed_indent()
   if s:indent_algo == 1
@@ -142,4 +139,3 @@ function! airline#extensions#whitespace#init(...)
     autocmd CursorHold,BufWritePost * unlet! b:airline_whitespace_check
   augroup END
 endfunction
-
diff --git a/doc/airline.txt b/doc/airline.txt
index 0df537c5..b40f36c2 100644
--- a/doc/airline.txt
+++ b/doc/airline.txt
@@ -491,6 +491,10 @@ eclim <https://eclim.org>
 
 * configure custom trailing whitespace regexp rule >
   let g:airline#extensions#whitespace#trailing_regexp = '\s$'
+
+* configure, which filetypes have special treatment of /* */ comments,
+  matters for mix-indent-file algorithm: >
+  let airline#extensions#c_like_langs = ['c', 'cpp', 'cuda', 'javascript', 'ld', 'php']
 <
 -------------------------------------                      *airline-tabline*
 Note: If you're using the ctrlspace tabline only the option marked with (c)