Php constant w3schools

Constant names are case-sensitive, and they also follow the same naming requirements like variables, except the leading. It is powerful enough to be at the core of the biggest blogging system on the web (WordPress). A variable can have a short name (like x and y) or a more descriptive name (age, carname, totalvolume).

It is considered best practice to define constants using only upper-case names. Rules for PHP variables: A variable starts with the sign, followed by the name of the variable. A class constant is declared inside a class with the const keyword.

It is also easy enough to be a beginner s first server side language.

Note: Unlike variables, constants are automatically global across the entire script. PHP provides a large number of predefined constants to any script which it runs. A constant is an identifier (name) for a simple value. Many of these constants, however, are created by various extensions, and will only be present when those extensions are available, either via dynamic loading or because they have been compiled in. A variable name must start with a letter or the underscore character.

The name of a constant follows the same rules as any label in PHP. A valid constant name starts with a letter or underscore (no sign before the constant name).
PHPVERSION The current PHP version as a string in leaseextra notation. It is possible to define constants with reserved or even invalid names, whose value can (only) be retrieved with constant.

Class constants can be useful if you need to define some constant data within a class. It is deep enough to run the largest social network (Facebook). Constant within a script is accessible to any area however, they can be scalar values. PHP Date and Time PHP Include PHP File Handling PHP File OpenRead PHP File CreateWrite PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP Filters Advanced PHP JSON PHP OOP PHP What is OOP PHP ClassesObjects PHP Constructor PHP Destructor PHP Access Modifiers PHP Inheritance PHP Constants PHP Abstract Classes PHP Traits PHP Static.

However, it is recommended to name the constants in all uppercase letters. A valid constant name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.

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