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An array containing additional output populated by modules, intended to be displayed in front of the main title tag that appears in the template The page title, for use in the actual HTML content An array containing additional output populated by modules, intended to be displayed after the main title tag that appears in the template Status and error messages that should be displayed prominently Tabs linking to any sub-pages beneath the current page Actions local to the page, such as Add menu on the menu administration interface A string of all the feed icons for the current page The node object, if there is an automatically loaded node associated with the page, and the node ID is the second argument in the page s path (e.g., node/12345 and node/12345/revisions, but not comment/reply/12345).

Console.WriteLine("Max of double: {0}", double.MaxValue); Console.WriteLine("Min of double: {0}", double.MinValue); Console.WriteLine("double.Epsilon: {0}", double.Epsilon); Console.WriteLine("double.PositiveInfinity: {0}", double.PositiveInfinity); Console.WriteLine("double.NegativeInfinity: {0}", double.NegativeInfinity); Console.WriteLine(); }

Next, consider the System.Boolean data type. The only valid assignment a C# bool can take is from the set {true | false}. Given this point, it should be clear that System.Boolean does not support a MinValue/MaxValue property set, but rather TrueString/FalseString (which yields the string "True" or "False", respectively). Add the following code statements to the DataTypeFunctionality() helper method: Console.WriteLine("bool.FalseString: {0}", bool.FalseString); Console.WriteLine("bool.TrueString: {0}", bool.TrueString); Figure 3-8 shows the output of invoking DataTypeFunctionality() from within Main().

The variables $page['help'], $page['highlighted'], $page['content'], $page['sidebar_first'], $page['sidebar_second'], $page['header'], and $page['footer'] represent regions on the page. A region represents the physical containers that a site administrator can assign any block-level element to (e.g., the logon form, the search block, a node, a view, or a menu). If you don t specify any regions in your theme s .info file, you get the regions just listed by default. I ll show you how to create additional regions in the upcoming section that describes how to construct your theme s .info file.

C# textual data is represented by the string and char keywords, which are simple shorthand notations for System.String and System.Char, both of which are Unicode under the hood. As you may already know, a string represents a contiguous set of characters (e.g., "Hello"), while the char can represent a single slot in a string (e.g., 'H'). The System.Char type provides you with a great deal of functionality beyond the ability to hold a single point of character data. Using the static methods of System.Char, you are able to determine

whether a given character is numerical, alphabetical, a point of punctuation, or whatnot. Consider the following method: static void CharFunctionality() { Console.WriteLine("=> char type Functionality:"); char myChar = 'a'; Console.WriteLine("char.IsDigit('a'): {0}", char.IsDigit(myChar)); Console.WriteLine("char.IsLetter('a'): {0}", char.IsLetter(myChar)); Console.WriteLine("char.IsWhiteSpace('Hello There', 5): {0}", char.IsWhiteSpace("Hello There", 5)); Console.WriteLine("char.IsWhiteSpace('Hello There', 6): {0}", char.IsWhiteSpace("Hello There", 6)); Console.WriteLine("char.IsPunctuation(' '): {0}", char.IsPunctuation(' ')); Console.WriteLine(); } As illustrated in the previous code snippet, many members of System.Char have two calling conventions: a single character or a string with a numerical index that specifies the position of the character to test.

This template file focuses on how regions are displayed on your site. The default region.tpl.php file is pretty simple essentially just displaying the content that is assigned to a region. < php if ($content): > <div class="< php print $classes; >"> < php print $content; > </div> < php endif; > The variables available to this template file by default are as shown in Table 9-4.

The .NET data types provide the ability to generate a variable of their underlying type given a textual equivalent (e.g., parsing). This technique can be extremely helpful when you wish to convert a bit of user input data (such as a selection from a GUI-based, drop-down list box) into a numerical value. Consider the following parsing logic within a method named ParseFromStrings(): static void ParseFromStrings() { Console.WriteLine("=> Data type parsing:"); bool b = bool.Parse("True"); Console.WriteLine("Value of b: {0}", double d = double.Parse("99.884"); Console.WriteLine("Value of d: {0}", int i = int.Parse("8"); Console.WriteLine("Value of i: {0}", char c = Char.Parse("w"); Console.WriteLine("Value of c: {0}", Console.WriteLine(); } b); d); i); c);