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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). Note: Unlike variables, constants are automatically global across the entire script.
Table of Contents ¶. A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script (except for magic constants, which aren't actually constants). Constants are case-sensitive.
Syntax. Predefined constants. Magic constants. A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script (except for magic constants, which aren't actually constants). Constants are case-sensitive. By convention, constant identifiers are always uppercase. Note:
constant (string $name): mixed. Return the value of the constant indicated by name. constant () is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function. This function works also with class constants and enum cases.
A constant is a name that holds a simple value that cannot be changed during the execution of the script. From PHP 7, a constant can hold an array. A constant can be accessed from anywhere in the script. Use the define() function or const keyword to define a constant.
The value of a constant is accessed simply by specifying its name. Unlike variables, a constant is not prepended with a $. It is also possible to use the constant () function to read a constant's value if the constant's name is obtained dynamically. Use get_defined_constants () to get a list of all defined constants.
Constants are variables whose values can't change once created. You can create a constant with the const keyword followed by the name and value of the constant. An alternative syntax for creating constants is the define() function. It accepts the name and value of the constant.
