In the second instalment of this article series dedicated to PHP 7, we continue our exploration of PHP 7 new features focusing on object-oriented programming support, classes, and interfaces.

PHP resource objects must be handled with several functions, and the resource object itself cannot contain any properties. resource is a PHP soft-reserved keyword, but there is no real resource type ...

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This excerpt from PHP and MySQL Web Development outlines a key step in object-oriented PHP.

PHP 8.1 adds support for enumerations, or enums for short, to declare an enumerated set of values that are similar to, though not the same as, class objects.