Often you may want to execute different program code depending on met conditions. To check if conditions are met, if and switch statements can be used. Example:
<?php
// storing the variable $user with the text admin
$user = "admin";
/*
Check, if the variable $user contains admin
To check == must be used
*/
If ($user == "admin")
{
// If $user == "admin", display Hello Administrator
echo "Hello Administrator!";
} else {
// Otherwise display Hello Guest
echo "Hello Guest!";
}
?>
Since admin was saved in the variable $user "Hello Administrator" will be displayed. To check if the statement is functional, you can assign a different text to the variable and reload the page. "Hello Guest" should now be displayed.
To distinguish between two conditions you can either use an else-if statement or solve it more elegantly using a switch statement. Example:
<?php
// storing the variable $user with the text admin
$user = "admin";
/*
Distinguishing between different cases by if/else/elseif
*/
if ($user == "admin") {
echo "Hello Administrator!";
} elseif ($user == "manager") {
echo "Hello Manager!";
} elseif ($user == "user") {
echo "Hello User!";
} else {
echo "Hello Guest!";
}
/*
Distinguishing between different cases with switch
*/
switch ($user) {
case "admin":
echo "Hello Administrator!";
break;
case "manager":
echo "Hello Manager!";
break;
case "user":
echo "Hello User!";
break;
default:
echo "Hello Guest!";
}
?>
elseif is a combined expression of else and if and simply saves writing time. Each case has to start with a case and end with a break except for the last case. The last one does not need a break. This is optional.
