The name of a constant follows the same rules as any label in PHP ie, name of constants must starts with a letter or underscore followed by any number of letters  

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To create a constant in a class, you use the keyword const followed by the constant name and the value it is equal to. The following code below creates a class 

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A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the entire script. The constant value is immutable.

PHP Constants. PHP constants are name or identifier that can't be changed during the execution of the script except for magic constants, which are not really constants.PHP constants can be defined by 2 ways:

Yes. Yes. Yes. Fuel System. Yes. Yes. Yes threshold voltage (constant).

PHP - Class Constants. Constants cannot be changed once it is declared. Class constants can be useful if you need to define some constant data within a class. A class constant is declared inside a class with the const keyword. Class constants are case-sensitive. However, it is recommended to name the constants in all uppercase letters.

Man etablerar konstant närvaro eller får konstanta upplopp. source. Complain.

So the PHP Variables and Constants is very important. Constants are defined using PHP's define () function, which accepts two arguments: The name of the constant, and its value. Constant name must follow the same rules as variable names, with one exception the "$" prefix is not required for constant names. To use dynamic constant names in your class you can use reflection feature (since php5): $thisClass = new ReflectionClass(__CLASS__); $thisClass->getConstant($constName); For example: if you want to filter only specific (SORT_*) constants in the class What is Constant in PHP. A constant is a name or an identifier for a fixed value. Constant are like variables, except that once they are defined, they cannot be undefined or changed (except magic constants ).
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Defining PHP constants. Name- Specified the name of constant.

Dynamic constant name in PHP. Ask Question Asked 10 years, 4 months ago. Active 8 months ago. Viewed 43k times 80. 13.
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PHP har ändrat hanteringen av skiftlägeskänslighet i många fall: All internal case insensitivity handling for class, function, and constant names is done according 

By convention, constant identifiers are always uppercase. You can define values in your config file using the names of your defined constants, e.g.


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Name = "Text" rem (4) Press Tab to add the tab without the space after the constant name. http://www.pitonyak.org/oo.php (Andrew Pitonyaks makro-sida)​.

In PHP 4 its value is always lowercased. __METHOD__: The class method name. (Added in PHP 5.0.0) The method name is returned as it was declared (case-sensitive). PHP is inefficient because it needs to be searched multiple times while processing constants.