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

Next
57
For example, the code
if ($totalqty == 0) {
echo "You did not order anything on the previous page!";
exit;
}
could be converted to this alternative syntax using the keywords if and endif:
if ($totalqty == 0) :
echo "You did not order anything on the previous page!";
exit;
endif;
Using declare
One other control structure in PHP, the declare structure, is not used as frequently in
day-to-day coding as the other constructs.The general form of this control structure is as
follows:
declare (directive)
{
// block
}
This structure is used to set execution directives for the block of code—that is, rules about
how the following code is to be run. Currently, only one execution directive, called
ticks, has been implemented.You set it by inserting the directive ticks=n. It allows
you to run a specific function every n lines of code inside the code block, which is principally
useful for profiling and debugging.
The declare control structure is mentioned here only for completeness. We consider
some examples showing how to use tick functions in Chapters 25,“Using PHP and
MySQL for Large Projects,” and 26, “Debugging.”
Next
Now you know how to receive and manipulate the customer’s order. In the next chapter,
you learn how to store the order so that it can be retrieved and fulfilled later.