PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Making Decisions with Conditionals
49
You can create code to calculate the discount using conditions and if and elseif statements.
In this case, you need to use the AND operator (&&) to combine two conditions
into one:
if ($tireqty < 10) {
$discount = 0;
} elseif (($tireqty >= 10) && ($tireqty = 50) && ($tireqty = 100) {
$discount = 15;
}
Note that you are free to type elseif or else if—versions with or without a space are
both correct.
If you are going to write a cascading set of elseif statements, you should be aware
that only one of the blocks or statements will be executed. It did not matter in this
example because all the conditions were mutually exclusive; only one can be true at a
time. If you write conditions in a way that more than one could be true at the same
time, only the block or statement following the first true condition will be executed.
switch Statements
The switch statement works in a similar way to the if statement, but it allows the condition
to take more than two values. In an if statement, the condition can be either
true or false. In a switch statement, the condition can take any number of different
values, as long as it evaluates to a simple type (integer, string, or float).You need to provide
a case statement to handle each value you want to react to and, optionally, a default
case to handle any that you do not provide a specific case statement for.
Bob wants to know what forms of advertising are working for him, so you can add a
question to the order form. Insert this HTML into the order form, and the form will
resemble Figure 1.6:
How did you find Bob’s?
I’m a regular customer
TV advertising
Phone directory
Word of mouth