코드 예제는 PHP에서 스위치 사용법을 보여줍니다.

<?php
  //switch细节
  //情况一：数值匹配的时候自动转换成字串
  $a=1;
  switch($a){
    case "1":
		echo &#39;hello1&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况二：数值匹配的时候自动转换成字符
  $a=1;
  switch($a){
    case &#39;1&#39;:
		echo &#39;hello2&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况三：字符匹配的时候自动转换成数值
  $a=&#39;1&#39;;
  switch($a){
    case 1:
		echo &#39;hello3&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况四：字串匹配的时候自动转换成数值
  $a="1";
  switch($a){
    case 1:
		echo &#39;hello4&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况五：float也可以匹配
  $a=1.1;
  switch($a){
    case 1.1:
		echo &#39;hello5&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况六：非0是true
  $a=true;
  switch($a){
    case 1:
		echo &#39;hello6&#39;;
		break;
	case true:
		echo &#39;hello61&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况七：能匹配boolean
  $a=true;
  switch($a){
    case true:
		echo &#39;hello7&#39;;
		break;
	case 2:
		echo &#39;hello71&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况八：能匹配null
  $a=null;
  switch($a){
    case 2://&#39;&#39;  ""  false 0 都能进入
		echo &#39;hello8&#39;;
		break;
	case null:
		echo &#39;hello81&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况九：退出顺序
  $a=5;
  switch($a){
    case 1:
		echo &#39;hello6&#39;;
		break;
	case 2:
		echo &#39;我是2号出口&#39;;
		break;
	case 5:
		echo &#39;我是5号出口&#39;;
		//break;
	case true:
		echo &#39;hello61&#39;;
		break;
	default:
		echo &#39;sorry none is the same!&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
   //情况十：退出顺序
  $a=50;
  switch($a){
	default:
		echo &#39;sorry none is the same!&#39;;
		//break;
    case 50:
		echo &#39;hello6&#39;;
		//break;
	case 2:
		echo &#39;我是2号出口&#39;;
		break;
	case 5:
		echo &#39;我是5号出口&#39;;
		//break;
	case 6:
		echo &#39;hello61&#39;;
		break;
  }
  echo &#39;<br/>&#39;.&#39;成功退出····&#39;;
  echo &#39;<hr/>&#39;;
?>

결과는 다음과 같습니다:
hello1
성공적으로 종료되었습니다····

---

hello2
성공적으로 종료되었습니다····

---

hello3
성공적으로 종료되었습니다····

---

hello4
성공적으로 종료····

---

hello5
종료 성공····

---

hello6
종료 성공····

---

hello7
종료 성공····

---

hello81
종료 성공····

---

나는 hello6 1 5번 출구에서
성공적으로 퇴장했습니다...

---

hello6 저는 2번 출구입니다
성공적으로 퇴장했습니다...

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