More About Arguments
You've already seen how to pass arguments to functions, but there's plenty more to cover. In this section, you'll look at a technique for giving your arguments default values and explore a method of passing variables by reference rather than by value. This means that the function is given an alias of the original value rather than a copy of it.
Setting Default Values for Arguments
PHP gives you a nifty feature to help build flexible functions. Until now, we've said that some functions require one or more arguments. By making some arguments optional, you can render your functions a little less autocratic.
Listing 6.10 creates a useful little function that wraps a string in an HTML font element. We want to give the user of ...
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