Help with PHP if contains

if i wanted to block url links or statements from a content post how do i do this

Example.

in the text bar someone places in http://www.sitename.com or www.sitename.com or sitename.com

mainly this would look for
http://
www.
.com

if it contains this information then it will not allow the post. and or it changes the entire url

http://www.sitename.com or www.sitename.com or sitename.com


to censored or something..

Can anyone help?


Thanks in advance..
TJ

 

i found this function for you at php.net under preg_match

function bigworldhostname($url){
    preg_match('@^(?:http://)?([^/]+)@i',$url, $matches);
   
    $host = $matches[1];

    preg_match('/[^.]+\.[^.]+$/', $host, $usHost);
    
    if (strlen($usHost[0])>5){
        return $usHost[0];
    }
    else {
        preg_match('/[^.]+\.[^.]+\.[^.]+$/', $host, $restofWorldHost);
        return $restofWorldHost[0];
    }
}

PHP:

 

How about this? I ignored URLs like this: sitename.com Because some people don't put spaces after their sentences, and it wouldn't let them post then if they typed something like looked like an URL.

$text = preg_replace('/(((ht|f)tps?:\/\/)|(www\.))([\w-\.]+)\.[a-z]{2,4}[^\r\n\s\t"]*/ie', "str_repeat('*', strlen('$0'))", $text);

PHP:

If you want to check for only .com domains, you can also do this:

if (preg_match('/(https?|ftp|www\.|\.com)/i', $text))
{
	// Throw error
}

PHP:

I think this was your initial idea, but I like the replacement thing better.

 

thanks very much exactly what i was looking for.

 

Check out http://us2.php.net/function.parse-url

This function breaks up a url into its parts and puts in into an array.

 

it seems to me that you must use strip_tags : http://www.php.net/strip_tags