switch case or case php

1switch (fruit) {
2  case apple:
3    code to be executed if fruit=apple;
4    break;
5  case banana:
6    code to be executed if fruit=banana;
7    break;
8    ...
9  default:
10    code to be executed if fruit is different from all fruits;
11}

1$age=20;
2switch ($age) {
3	case 19:
4        echo "Age is 18";
5        break;
6    case 20:
7        echo "Age is 20";
8        break;
9    case 21:
10        echo "Age is 21";
11        break;
12}

1switch ($i) {
2    case 0:
3        echo "i equals 0";
4        break;
5    case 1:
6        echo "i equals 1";
7        break;
8    case 2:
9        echo "i equals 2";
10        break;
11    default:
12       echo "i is not equal to 0, 1 or 2";
13}

1switch ($your_variable)
2{
3    case 1:
4    case 2:
5        echo "the value is either 1 or 2.";
6    break;
7}
8