Creating a PHP Constant: By using define() function, you can create a constants which accept two arguments: The name of the constant and its value.

Configure the family in LocalSettings.php, in four broad sections: (or similar), and the MW_DB constant (and environment variable) to identify different wikis (​e.g. as a variable if ($wikiId == 'wiki1') { $wgSitename = "Wiki name"; $​wgServer 

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Get all the constants defined in the class, loop over them and compare the values of those constants with the value of your variable. The constant value is immutable. Constant within a script is accessible to any area; however, they can be scalar values. Constant names are case-sensitive, and they also follow the same naming requirements like variables, except the leading $. It is considered best practice to define constants using only upper-case names.

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If you have defined a constant, it can never be changed or undefined. To define a constant you have to use define () function and to retrieve the value of a constant, you have to simply specifying its name. I'm assuming you would like to get the name of the constant based on the value of your variable (value of variable == value of constant). Get all the constants defined in the class, loop over them and compare the values of those constants with the value of your variable.

A constant is a variable with a value that cannot be changed by the script. Therefore, such a value must be assigned at the same time that the constant is created. Constants may not be redefined or undefined once they have been set. PHP provides two methods for creating constants: the const modifier and the define () function.

Usually, constant names use all-uppercase letters, with underscores to separate words within the name. 2015-01-21 · Constants. Constants are like variables except that once they are defined they cannot be changed or undefined. 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).

A constant is an identifier (name) for a simple value.
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It is considered best practice to define constants using only upper-case names. You can use the [Reflection] [1] for this. Assuming you have the below class. class Profile { const LABEL_FIRST_NAME = "First Name"; const LABEL_LAST_NAME = "Last Name"; const LABEL_COMPANY_NAME = "Company"; } $refl = new ReflectionClass ('Profile'); print_r ($refl->getConstants ()); Share.

These constants are called "magic constants." No. With Strings, there is no way for PHP to tell string data apart from constant identifiers. This goes for any of the string formats in PHP, including heredoc. constant () is an alternative way to get hold of a constant, but a function call can't be put into a string without concatenation either.
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19 Jan 2015 PHP lacks a good way of creating enumerations. e.g. "KEY_" * @param boolean $assoc Return associative array with constant name as key 

define() should be used when defining a constant  15 Feb 2021 PHP Enum implementation. Enum class of all Enum constants (constant name in key, Enum instance in value); isValid() Check if tested value  The name of a constant follows the same rules as any label in PHP. A valid constant name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thusly: ^ [a-zA-Z_\x80-\xff] [a-zA-Z0-9_\x80-\xff]*$ PHP Constants 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). As of PHP 5.4.6 constant () pays no attention to any namespace aliases that might be defined in the file in which it's used.

PHP Constants are created using define () function. This function takes two parameters first is the name and second is the value of the constant defined. The name of the constant starts using letters or underscores and not with a number. It can start with a letter or underscore followed by letters, underscores or numbers.

Viewed 43k times 80. 13. I am trying to create a constant name PHP Constants Constant is a name or an identifier for a fixed value. Constant are like variables except for that one they are defined so they can not be undefined or changed.

A constant name must start with letter(a-z or A-Z) or underscore(_) followed by any number of letters, numbers or underscores. Constant name cannot start with numbers. The scope of constant is global means you can access constants anywhere in script.