How to stop spam (several characters in a row no spaces)

[virtuexru]

How would I be able to detect, something like this is input:

 

"aaaaaaaaaaaaaaa dddddddddddddd"

 

So basically I need something to catch a string over say 10 characters without spaces.

 

[effigy]

<pre>
<?php
$tests = array(
	'a',
	'aaa',
	'aaaaaa',
	'aaaaaaaaa',
	'aaaaaaaaaaaa',
	'aaaaaaaaaaaaaaa',
	'b aa',
	'bbb aaaaaa',
	'bbbbbb aaaaaaaaa',
	'bbbbbbbbb aaaaaaaaaaaa'
);
foreach ($tests as $test) {
	echo $test, '<br>  ';
	echo preg_match('/(.)(?=\1{9})/', $test) ? 'Spam' : 'Not Spam';
	echo '<hr>';
}
?>
</pre>

[Lytheum]

    function spamcheck($text,$nr=10)
   {
       $spamtext=explode(" ",trim($text));
       $newtext=array();
       foreach($spamtext as $k=>$txt)
       {
           if (strlen($txt)>$nr)
           {
               $txt=wordwrap($txt, $nr, "-", 1);
           }
           $newtext[]=$txt;
       }
       return implode(" ",$newtext);
   } 

 

So..

 

$spam = 'Spaaaaaaaaaaaaaaaam';
spamtext($spam);

 

Would Return ->

 

"Spaaaaaaa-

aaaaaaaam"

 

Just trying to help ($nr is how many characters you want it to detect)