PHP, MySQL & JavaScript All in One, Sams Teach Yourself by Meloni Julie C

Author:Meloni, Julie C. [Meloni, Julie C.]
Language: eng
Format: azw3
ISBN: 9780134439587
Publisher: Pearson Education
Published: 2017-09-21T04:00:00+00:00

More About Arguments

You’ve already seen how to pass arguments to functions, but there’s plenty more to cover. This section covers a technique for giving your arguments default values and explores 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 provides a nifty feature to help build flexible functions. Until now, you’ve heard that some functions require one or more arguments. By making some arguments optional, you can render your functions a little less autocratic.

Listing 13.10 creates a useful little function that wraps a string in an HTML span element. To give the user of the function the chance to change the font-size style, you can demand a $fontsize argument in addition to the string (line 2).

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