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Invoking a Function
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More than 1,000 functions are built into the standard PHP distribution, many of which you’ll see
throughout this book. You can invoke the function you want simply by specifying the function name,
assuming that the function has been made available either through the library’s compilation into the
installed distribution or via the include() or require() statement. For example, suppose you want to
raise five to the third power. You could invoke PHP’s pow() function like this:

If you want to output the function results, you can bypass assigning the value to a variable, like this: