21.4. Creating Stock Charts
Modern applications are not only used to store data; they also are essential for displaying data in a easy-to-understand and comfortable way. One application where displaying data plays a key role is tools for displaying information about stocks. The progression of the value of a certain stock is displayed in charts and can easily be displayed using PHP's GD interface. In this section you will see how to build a rudimentary tool for monitoring stocks. Keep in mind that you will see a rudimentary application, not a sophisticated one. The reason is that writing a complex application leads to tons of code that cannot be discussed in this book reasonably. Therefore we prefer to focus on the essential components of such ...
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