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Dear All PHP Master, Kindly need your help (I'm sorry my Bad English), I'm new in PHP and OOP in PHP please help to check I have class to convert number to words below, but when I'm running it the result in browser is error with error message : Notice: Undefined variable: str in C:\xampp\htdocs\latihan\oop.php on line 16 Notice: Undefined variable: str in C:\xampp\htdocs\latihan\oop.php on line 14 Notice: Undefined variable: str in C:\xampp\htdocs\latihan\oop.php on line 16 seratus dua puluh tiga juta empat ratus lima puluh enam ribu tujuh ratus delapan puluh sembilan here it's my code to convert number to words : <?php Class Terbilang { Public function terbilang() { $this->dasar = array(1=>'satu','dua','tiga','empat','lima','enam','tujuh','delapan','sembilan'); $this->angka = array(1000000000000,1000000000,1000000,1000,100,10,1); $this->satuan = array('triliun','milyar','juta','ribu','ratus','puluh',''); } Public function eja($n) { $i=0; while($n!=0){ $count = (int)($n/$this->angka[$i]); if($count>=10) $str .= $this->eja($count). " ".$this->satuan[$i]." "; else if($count > 0 && $count < 10) $str .= $this->dasar[$count] . " ".$this->satuan[$i]." "; $n -= $this->angka[$i] * $count; $i++; } $str = preg_replace("/satu puluh (\w+)/i","\\1 belas",$str); $str = preg_replace("/satu (ribu|ratus|puluh|belas)/i","se\\1",$str); return $str; } } $bilangan = new Terbilang; echo $bilangan -> eja(123456789); //shouldbe show :seratus dua puluh tiga juta empat ratus lima puluh enam ribu tujuh ratus delapan puluh sembilan ?>