Object-Oriented PHP: Concepts, Techniques, and Code by Peter Lavin

By Peter Lavin

Object-Oriented PHP indicates builders the right way to benefit from the hot object-oriented good points of personal home page. operating in the context of concrete examples, the ebook starts with code appropriate with Hypertext Preprocessor four and five, after which specializes in object-orientation in Hypertext Preprocessor five. The author's useful technique makes use of a variety of code examples, on the way to support builders wake up to hurry with item orientated personal home page fast, and exhibit them the right way to follow what they learn how to daily occasions. All code samples can be found for obtain at the book's significant other site.

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The code for the new constructor and a private method called from within the constructor is shown in Listing 5-1. ")); //replace word separator $title = str_replace($this->replacechar," ",$title); return $title; } Listing 5-1: The constructor and the createTitle method The original constructor for this class accepted only one parameter—a directory name. You are now passing an additional parameter, $replacechar, and it has a default value of “_”. This parameter will function as the character in a filename and will be replaced by a space in order to make a readable, English “title” from the filename.

If you use a deprecated function, you’ll see a warning if the error-reporting level is set to E_STRICT (a useful technique for discovering where your code may need upgrading and discussed in more detail in Appendix A). In another example, the get_parent_class, get_class, and get_class_methods functions now return a casesensitive result (though they don’t require a case-sensitive parameter), so if you are using the returned result in a case-sensitive comparison you will have to make changes. Pass By Reference The preceding examples of changes are relatively minor and fairly easy to detect and upgrade.

Any variable declared at this level, namely inside the braces that enclose the class but outside any class function, is an instance variable or, as we might also refer to it, a data member. ) Instance variables are sometimes also referred to as properties. The placement of instance variables outside of any function indicates that they have scope throughout the class. Their visibility is not restricted to any specific function—they can be accessed from anywhere within the class. You could say they are global to the class.

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