Switch
The switch expression branches evaluation based on an equality check of a value. It also handles a default case, when none of the explicit cases match.
Each case is an expression, and shall be used that way.
switch use a relaxed comparison between the parameter value and the case values. This means that some type juggling happens, and some literals might behave as identical.
<?php
$b = 1;
switch ($i) {
case 0:
echo 'i equals 0';
break;
case 1:
echo 'i equals 1';
break;
case $b + 1:
echo 'i equals '.($b + 1);
break;
default:
echo 'i is none of the expected values.';
}
switch (false) {
case null:
// false == null so this is the case
echo 'This is null';
break;
case '':
echo 'This is empty string';
break;
default:
echo 'This is none of the expected values.';
}
?>