About a function strlen(Banned words(

I have a function, function is that. <?php function sanitize_core($text) { global $bannedWords; $text = htmlspecialchars($text, ENT_NOQUOTES); $text = str_replace("\n\r","\n",$text); $text = str_replace("\r\n","\n",$text); $text = str_replace("\n"," <br> ",$text); $number_word = explode(" ",$text); for($x=0;$x<count($number_word);$x++) { for ($i=0;$i < count($bannedWords);$i++) { if (stripos($text, $bannedWords[$i]) !== false) { /*$pos = stripos($text, $bannedWords[$i]); $word = substr($text,$pos,strlen($bannedWords[$i])); $first = substr($text,0,$pos); $final = substr($text,$pos+strlen($bannedWords[$i]),strlen($text)-($pos+$bannedWords[$i])); $text = $first.str_repeat("*",strlen($bannedWords[$i])).$final;*/ $text = str_ireplace($bannedWords[$i], str_repeat("*",strlen($bannedWords[$i])), $text); } //$text = str_ireplace(' '.$bannedWords[$i].' ',' '.str_repeat("*",strlen($bannedWords[$i])).' ',' '.$text.' '); } } $search = array('Ç','ç','Ğ','ğ','ı','İ','Ö','ö','Ş','ş','Ü','ü'); $replace = array('c','c','g','g','i','i','o','o','s','s','u','u'); $text = str_replace($search,$replace,$text); $text = trim($text); return $text; } $bannedWords = array( 'fuck','0','sakaci' ); $test_word = "a 1 2 5 s p o c X"; echo sanitize_core($test_word); ?> The functions is works perfect, so dont remove anything, ı wanna only add something. if I write only one letter, it should replace with * so you need to add minumum strlen. Examples, if I echo H e l l o or H all will * because if one letter after space , it will * (because minumum word should 2 ) if I echo only "H" it will also * So edit this function and send me.