php设计模式 Interpreter(解释器模式)

复制代码 代码如下:

class expression
{
function interpreter($str)
{
return $str;
}
}
class expressionNum extends expression
{
function interpreter($str)
{
switch($str)
{
case "0": return "零";
case "1": return "一";
case "2": return "二";
case "3": return "三";
case "4": return "四";
case "5": return "五";
case "6": return "六";
case "7": return "七";
case "8": return "八";
case "9": return "九";
}
}
}
class expressionCharater extends expression
{
function interpreter($str)
{
return strtoupper($str);
}
}
class Interpreter
{
function execute($string)
{
$expression = null;
for($i = 0;$i$temp = $string[$i];
switch(true)
{
case is_numeric($temp): $expression = new expressionNum(); break;
default: $expression = new expressionCharater();
}
echo $expression->interpreter($temp);
}
}
}
$obj = new Interpreter();
$obj->execute("12345abc");
?>