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

26 Chapter 1 PHP Crash Course
Figure 1.4
The form variables the user typed in are easily accessible in
processorder.php.
The following sections describe a couple of interesting elements of this example.
String Concatenation
In the sample script, echo prints the value the user typed in each form field, followed by
some explanatory text. If you look closely at the echo statements, you can see that the
variable name and following text have a period (.) between them, such as this:
echo $tireqty.’ tires’;
This period is the string concatenation operator, which adds strings (pieces of text)
together.You will often use it when sending output to the browser with echo.This way,
you can avoid writing multiple echo commands.
You can also place simple variables inside a double-quoted string to be echoed.
(Arrays are somewhat more complicated, so we look at combining arrays and strings in
Chapter 4,“String Manipulation and Regular Expressions.”) Consider this example:
echo “$tireqty tires”;