adding phpcs linter

ale_linters/php/phpcs.vim

@@ -0,0 +1,58 @@
+" Author: jwilliams108 <https://github.com/jwilliams108>
+" Description: phpcs for PHP files
+
+if exists('g:loaded_ale_linters_php_phpcs')
+    finish
+endif
+
+let g:loaded_ale_linters_php_phpcs = 1
+
+function! ale_linters#php#phpcs#GetCommand(buffer)
+    let command = 'phpcs -s --report=emacs --stdin-path=%s'
+
+    " This option can be set to change the standard used by phpcs
+    if exists('g:ale_linters_php_phpcs_standard')
+        let command .= ' --standard=' . g:ale_linters_php_phpcs_standard
+    endif
+
+    return command
+endfunction
+
+function! ale_linters#php#phpcs#Handle(buffer, lines)
+    " Matches against lines like the following:
+    "
+    " /path/to/some-filename.php:18:3: error - Line indented incorrectly; expected 4 spaces, found 2 (Generic.WhiteSpace.ScopeIndent.IncorrectExact)
+    let pattern = '^.*:\(\d\+\):\(\d\+\): \(.\+\) - \(.\+\) \(\(.\+\)\)$'
+    let output = []
+
+    for line in a:lines
+        let l:match = matchlist(line, pattern)
+
+        if len(l:match) == 0
+            continue
+        endif
+
+        let text = l:match[4]
+        let type = l:match[3]
+
+        " vcol is Needed to indicate that the column is a character.
+        call add(output, {
+        \   'bufnr': a:buffer,
+        \   'lnum': l:match[1] + 0,
+        \   'vcol': 0,
+        \   'col': l:match[2] + 0,
+        \   'text': text,
+        \   'type': type ==# 'warning' ? 'W' : 'E',
+        \   'nr': -1,
+        \})
+    endfor
+
+    return output
+endfunction
+
+call ALEAddLinter('php', {
+\   'name': 'phpcs',
+\   'executable': 'phpcs',
+\   'command_callback': 'ale_linters#php#phpcs#GetCommand',
+\   'callback': 'ale_linters#php#phpcs#Handle',
+\})