About Numbers
When I began discussing variables, I was explicit in stating that PHP has both integer and floating-point (decimal) number types. In my experience, though, these two types can be classified under the generic title numbers without losing any valuable distinction (for the most part). Valid number-type variables in PHP can be anything like
8
3.14
10980843985
-4.2398508
4.4e2
Notice that these values are never quoted—in which case they’d be strings with numeric values—nor do they include commas to indicate thousands. Also, a number is assumed to be positive unless it is preceded by the minus sign (-).
Along with the standard arithmetic operators you can use on numbers (Table 1.1), there are dozens of functions. Two I’ll introduce here ...
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