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Informations about the package support-constants
Helpers for constants and enumerations
The documentation is actual for version 1.0.
Supporting classes for constants of PHP.
Named constants and enumerations are used for immutable values. The package classes contain functions for getting a list of constants and their values without thrown exceptions of PHP.
Introduction
Install the package using Composer or manually.
Use one of the classes.
Use their features!
AbstractEnum
AbstractConstants
AbstractConstants is the abstract class for implementing a list of named constants and getting their values.
| Function | Description |
|---|---|
| Returns all constants of the class. | |
| The alias of the function. | |
| Returns an array of constants defined in the called class without constants of parrent classes. | |
| Returns all constants of parent classes. | |
| $name - a name of constant. Returns a value of a given constant if it exists, else returns null. This is a safe method for calling constants, in otherwise when you calls undefined constants you will catch an error. |
|
| $name - a name of constant. Checks whether a given constant exists and is defined in the class. |
See the example below. Down there is implementing of the base (first) class of constants.
Example #1 Implementing the first (parent) class with constants
After implementing the class you can get a list of constants from this class. Use or to do this.
Example #2 Getting all constants from the parent class
If you want to get one value then use the function. The function gets a case-sensitive name of constant. By convention, constant identifiers are always uppercase.
Example #3 Getting values of constants of the class
The Roles class contains the constants for us.
You will probably want some other constants. Extend the class to solve the problem. This need exists when you uses third-party classes.
Example #4 Extending the parent class
See the examples of the new child class.
Example #5 Checking of existing constants
Example #6 Getting new constants
Example #6 Getting a value of the replaced constant
You can get some constant using the standard PHP syntax. If you try to take a undefined constant then you will catch an error. If you are not sure about an existing constant then use the function and you will not catch an error.
Example 7 Getting values using the standard PHP function
AbstractEnum
AbstractEnum is the abstract class for implementing a list of named constants and getting their values. It was extended from AbstractConstants.
In contract to the Belca\Support\AbstractConstants class, the Belca\Support\AbstractEnum uses a constant with default value.
| Function | Description |
|---|---|
| Returns all constants of the class. | |
| The alias of the function. | |
| Returns an array of constants defined in the called class without constants of parrent classes. | |
| Returns all constants of parent classes. | |
| $name - a name of constant. Returns a value of a given constant if it exists, else returns null. This is a safe method for calling constants, in otherwise when you calls undefined constants you will catch an error. |
|
| $name - a name of constant. Checks whether a given constant exists and is defined in the class. |
|
| Returns the last defined default constant. |
The function that return a list of contains do not return the DEFAULT constant.
This class have a new function: the function. The other functions are the same.
Example #8 Implementing the first (parent) class with a default value
Get the default value using the function.
Example #9 Getting the default value
Also you can get the default value using the PHP syntax.
Example #10 Getting the default value using the PHP syntax
You can redefine the default constant by means of extending class.
Example #11 Redefining the default constant
License
The package and other Belca components are open-sourced software licensed under the MIT license.
