Download A Web for Everyone: Designing Accessible User Experiences by Whitney Quesenbery, Sarah Horton PDF

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By Whitney Quesenbery, Sarah Horton

While you are in control of the consumer adventure, improvement, or method for an internet site, an internet for everybody might help you are making your website obtainable with out sacrificing layout or innovation. Rooted in common layout rules, this e-book offers recommendations: functional suggestion and examples of the way to create websites that everybody can use.

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Additional info for A Web for Everyone: Designing Accessible User Experiences (1st Edition)

Example text

Final keyword To stop a child class from overriding a method it can be defined as final. A class itself can also be defined as final to prevent any class from extending it. final class NotExtendable { final function notOverridable() {} } Instanceof operator As a safety precaution, you can test to see whether an object can be cast to a specific class by using the instanceof operator. This operator returns true if the left side object can be cast into the right side type without causing an error.

Compile-time constants are also slightly 52 CHAPTER 13 N CONSTANTS faster than run-time constants. The only exception is when the constant is conditionally defined, or an expressional value is required, in which case define must be used. Constant guideline In general, it is a good idea to create constants instead of variables if their values do not need to be changed. This ensures that the variables will not be changed anywhere in the script by mistake, which in turn helps to prevent bugs. Magic constants PHP provides eight predefined constants.

31 CHAPTER 8 N FUNCTIONS function myFunc() { return 'Hello'; // exit function and return value } echo myFunc(); // "Hello" A function without a return value will be evaluated as null. Scope and lifetime Normally, a PHP variable’s scope starts where it is declared and lasts until the end of the page. However, a local function scope is introduced within functions. Any variable used inside a function is by default limited to this local scope. Once the scope of the function ends, the local variable is destroyed.

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