PHP switch() Case Statement

<?php
switch ($value) {
case "expression 1":
    //statement 1
    break;
case "expression 2":
    //statement 2
    break;
case "expression 3":
    //statement 3
    break;
}
?>

<?php
$i=2;
if ($i == 0) {
    echo "i number = 0"."<br>";
} elseif ($i == 1) {
    echo "i number = 1"."<br>";
} elseif ($i == 2) {
    echo "i number = 2"."<br>";
}
echo "<hr>";
$i=0;
switch ($i) {
case 0:
    echo "i number = 0"."<br>";
    break;
case 1:
    echo "i number = 1"."<br>";
    break;
case 2:
    echo "i number = 2"."<br>";
    break;
}
?>