public function distance($text1, $text2)
    {
        $distance = 0;
        $strLength = strlen($text1);
        for($index = 0; $index < $strLength; $index++)
        {
            if($text1[$index] != $text2[$index]) { 
                $distance++;
            }
        }
        return $distance;
    }
public function distance($text1, $text2)
    {
        $distance = 0;
        $strLength = strlen($text1);
        for($index = 0; $index < $strLength; $index++)
        {
            if($text1[$index] != $text2[$index]) { 
                $distance++;
            }
        }
        return $distance;
    }
public function distance ( $ text1 , $ text2 ) { $ distance = 0 ; $ strLength = strlen ( $ text1 ) ; for ( $ index = 0 ; $ index < $ strLength ; $ index ++ ) { if ( $ text1 [ $ index ] != $ text2 [ $ index ] ) { $ distance ++ ; } } return $ distance ; }
Return the hamming distance, expects the strings to be equal length
@param string $text1
@param string $text2
@return int
Return the hamming distance expects the strings to be equal length