Regular Expression

[codezilla]

Hi,

I'm trying to format the request headers:

HTTP_ACCEPT
HTTP_ACCEPT_CHARSET
HTTP_ACCEPT_ENCODING
HTTP_ACCEPT_LANGUAGE
HTTP_CACHE_CONTROL
HTTP_CONNECTION
HTTP_COOKIE
HTTP_HOST
HTTP_KEEP_ALIVE
HTTP_REFERER
HTTP_USER_AGENT

into:

Accept
Accept-Charset
Accept-Encoding
Accept-Language
Cache-Control
Connection
Cookie
Host
Keep-Alive
Referer
User-Agent

Right now I'm doing it like so:

preg_replace(
    '/HTTP_(.*)/e', 
    'str_replace(" ", "-", ucwords(strtolower(str_replace("_", " ", "\1"))))', 
    array_values(preg_grep('/^HTTP/', array_keys($_SERVER)))); 

Is there a more efficient/less ugly/better way to do this?

Thanks!

[anode]

Assuming two str_replaces are less resource intensive than one preg.

$str = str_replace('HTTP_', '', $str);
$str = str_replace ('_', '-', $str);
$str = ucwords(strtolower($str)); 

[Dr Livingston]

Not bad Anode

Codezilla - Why the changes anyway ?

[codezilla]

Two things:

1) Anode's code is only a partial solution -- though I certainly appreciate the fact that he offered any help at all! I suppose the applied version of his code would be this:

$headers = array();
foreach ($_SERVER as $key => $val)
{
    if (substr($key, 0, 5) == 'HTTP_')
    {
        $str = str_replace('HTTP_', '', $key);
        $str = str_replace ('_', '-', $str);
        $str = ucwords(strtolower($str));
        $headers[] = $str;
    }
} 

Unfortunately, this doesn't capitalize the letters after hyphens (e.g. "User-agent" vs. "User-Agent") -- although it's easily correctable, just need to add a line and re-order them. I have no idea if this would be faster than my code or not.

2) I felt that my code was...well...ugly and that maybe a regular expression with better back-reference handling would get the job done more nicely.

I'm probably just over thinking things that really aren't that important though.

[anode]

How about:

$headers = array(); 
foreach ($_SERVER as $key => $val) {
 
    if (substr($key, 0, 5) == 'HTTP_') { 
     $arr = explode('_',strtolower(substr($key, 5))); 
     $str = implode('-', array_map('ucwords',$arr));
     $headers[] = $str; 
   } 
}