What is the use of switch statement in PHP? code example

Example 1: php switch

$age=20;
switch ($age) {
	case 19:
        echo "Age is 18";
        break;
    case 20:
        echo "Age is 20";
        break;
    case 21:
        echo "Age is 21";
        break;
}

Example 2: switch case php

switch (fruit) {
  case apple:
    code to be executed if fruit=apple;
    break;
  case banana:
    code to be executed if fruit=banana;
    break;
    ...
  default:
    code to be executed if fruit is different from all fruits;
}