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PHP 5 introduced private and protected member variables and methods, along with abstract classes and final classes as well as abstract methods and final methods. It also introduced a standard way of declaring constructors and destructors , similar to that of other object-oriented languages such as C++ , and a standard exception handling model.
The class attribute provides a way of classifying similar elements. Multiple class names can be added by separating them with spaces. [10] [11] Semantically, for example, classes are used in microformats. Additionally authors of style sheets can construct selectors that match elements by class for styling
It comprises what should be considered the standard coding elements that are required to ensure a high level of technical interoperability between shared PHP code. [5] N/A: N/A: N/A: Accepted [4] PSR-2: Coding Style Guide: It considers PSR-1 and it is intended to reduce cognitive friction when scanning code from different authors.
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Examples of this include nesting a "ul" element directly inside another "ul" element for any of the HTML 4.01 or XHTML DTDs. Dan Connolly cites the use of title element outside the head section. [1] Use of proprietary or undefined elements and attributes instead of those defined in W3C recommendations.
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As a result, a PHP 5.3 release was created in 2009, with many non-Unicode features back-ported from PHP 6, notably namespaces. In March 2010, the project in its current form was officially abandoned, and a PHP 5.4 release was prepared to contain most remaining non-Unicode features from PHP 6, such as traits and closure re-binding. [49]
An "id" is a unique identifier. Each time this attribute is used in a document it must have a different value. If you are using this attribute as a hook for style sheets it may be more appropriate to use classes (which group elements) than id (which are used to identify exactly one element).