Often it is necessary to save information for later use. PHP, like most programming languages, offers the concept of variables. Variables give a name to the information you want to save and manipulate. Listing 1.3 expands on our example by using variables.
The first block of PHP code puts values into some variables. The four variables are YourName, Today, CostOfLunch, and DaysBuyingLunch. PHP knows they are variables because they are preceded by a dollar sign ($). The first time you use a variable in a PHP script, some memory is set aside to store the information you wish to save. ...