.vimrc command for WordPress-style whitespace correction in current buffer

.vimrc

command! WPCodingStandards call WPCodingStandards()
function! WPCodingStandards()
    " Space after opening paren
    execute '%s/(\([^\t) ]\)/( \1/ge'

    " Space before closing paren
    execute '%s/\([^\t( ]\))/\1 )/ge'

    " No spaces when casting types
    execute '%s/(\s*\(array\|int\|object\|string\|float\)\s*)/(\1)/ge'

    " Tabs not spaces
    execute '%s/^    \([^\t ]\)/\t\1/ge'
    execute '%s/^        \([^\t ]\)/\t\t\1/ge'
    execute '%s/^            \([^\t ]\)/\t\t\t\1/ge'
    execute '%s/^                \([^\t ]\)/\t\t\t\t\1/ge'
    execute '%s/^                    \([^\t ]\)/\t\t\t\t\t\1/ge'
    execute '%s/^                        \([^\t ]\)/\t\t\t\t\t\t\1/ge'
    execute '%s/^                            \([^\t ]\)/\t\t\t\t\t\t\t\1/ge'

    " control structures
    execute '%s/\(while\|foreach\|if\|else\|for\|do\|try\)(/\1 (/ge'
    execute '%s/}else/} else/ge'
    execute '%s/else{/else {/ge'

    " brackets
    execute '%s/){/) {/ge'

    " commas should have trailing spaces in argument lists
    execute '%s/,\$/, $/ge'
endfunction
noremap <F8> :WPCodingStandards<cr>

Update: better handling for leading tabs vs spaces; no spaces when type casting (eg (int) $foo)

Update: improved handling for () fixes that were canceling out other spaces

Hi. This is really useful, but the spaces inside braces breaks regular expressions; e.g. something like:

return preg_replace( '/-([0-9]*)x([0-9]*)\.(jpg|jpeg|png|gif|webp)$/', ".$3", $url );

becomes:

return preg_replace( '/-( [0-9]* )x( [0-9]* )\.( jpg|jpeg|png|gif|webp )$/', ".$3", $url );

and fails to match. Any ideas for how to leave these alone?