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PHP5 object-oriented programming topic
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Basic knowledge of object-oriented programming in PHP5
As early as PHP 3 version, PHP has supported object-oriented programming (OOP). Although object-oriented programming was available at the time, PHP's support for it was very simple, and it had not been significantly improved by PHP 4. This was mainly due to backward compatibility issues. Later, due to the widespread increase in OOP support requirements, PHP 5 redesigned the entire object-oriented model, added a large number of features and changed the basic operating mechanism of the "object" itself.
If you are new to PHP, this chapter will describe the entire object-oriented model for you. Even if you are familiar with PHP 4, you should read this chapter because almost everything about OOP has been changed in PHP 5.