Vim configuration questions

  question, vim

Under ubuntu14.04, the root user used did not have ~/.vimrc files in the home directory, so the /etc/vim/vimrc files were modified.
An error occurred in source vimrc before modification.

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What is the problem?
$ cat vimrc

” All system-wide defaults are set in $VIMRUNTIME/debian.vim and sourced by
” the call to :runtime you can find below. If you wish to change any of those
” settings, you should do it in this file (/etc/vim/vimrc), since debian.vim
” will be overwritten everytime an upgrade of the vim packages is performed.
” It is recommended to make changes after sourcing debian.vim since it alters
” the value of the ‘compatible’ option.

” This line should not be removed as it ensures that various options are
” properly set to work with the Vim-related packages available in Debian.
runtime! debian.vim

” Uncomment the next line to make Vim more Vi-compatible
” NOTE: debian.vim sets ‘nocompatible’. Setting ‘compatible’ changes numerous
” options, so any other options should be set AFTER setting ‘compatible’.
“set compatible

” Vim5 and later versions support syntax highlighting. Uncommenting the next
” line enables syntax highlighting by default.
if has(“syntax”)
syntax on
endif

” If using a dark background within the editing area and syntax highlighting
” turn on this option as well
“set background=dark

” Uncomment the following to have Vim jump to the last position when
” reopening a file
“if has(“autocmd”)
” au BufReadPost * if line(“‘””) > 1 && line(“‘””) <= line(“$”) | exe “normal! g'”” | endif
“endif

” Uncomment the following to have Vim load indentation rules and plugins
” according to the detected filetype.
“if has(“autocmd”)
” filetype plugin indent on
“endif

” The following are commented out as they cause vim to behave a lot
” differently from regular Vi. They are highly recommended though.
“set showcmd ” Show (partial) command in status line.
“set showmatch ” Show matching brackets.
“set ignorecase ” Do case insensitive matching
“set smartcase ” Do smart case matching
“set incsearch ” Incremental search
“set autowrite ” Automatically save before commands like :next and :make
“set hidden ” Hide buffers when they are abandoned
“set mouse=a ” Enable mouse usage (all modes)

” Source a global configuration file if available
if filereadable(“/etc/vim/vimrc.local”)
source /etc/vim/vimrc.local
endif

Is there any problem here?

I need to add an incomplete PHP function now.
echo “autocmd FileType php set omnifunc=phpcomplete#CompletePHP”>>vimrc
source vimrc
Now that this mistake has occurred, what is the problem?

Source is used to configure the current shell environment. vim cannot use the source command. Vim will automatically read vimrc after the next startup. source is not required.

~/.vimrc does not exist and can be used.touch ~/.vimrcTo create, vim will automatically read it when it starts.