By Toby Butzon

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Body> Since none of this code is enclosed in PHP tags, every line is sent as output. Also, the output doesn’t rely in any way on any variables or data sources, so it is classified as static. 52 Chapter 3: Program Input and Output NOTE Recall from Chapter 1, “Welcome to PHP,” that anything outside of PHP tags is sent straight to output without being processed in any way. Even if a variable is inserted into this code, it would not be interpreted as a variable; rather, the text would be sent just as it appeared.

99 The second example is a float represented in scientific notation. The e, as is often the case on graphing calculators, means “times 10 to the”. It is followed by whatever power 10 should be raised to in order to put the decimal wherever you want it. 5. Floats also have limitations—floats are accurate enough for general-purpose use, but if you need to store a number with an extremely long decimal value, you will need to look into the arbitrary precision math functions (BCMath or GMP) on the PHP Web site.

Variable scope is basically divided between the global scope and individual functions; each (the global scope and each function) has a scope of its own, and, thus, no variables will be overwritten by a function or segment of code that isn’t supposed to do so. • Functions • Class member functions Type Casting 43 Type Casting Type casting is specifying the type that a certain variable should be evaluated as for a particular statement. This is useful, for example, if you want to use just the integer portion of a floating-point number.

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