PHP Constants- Tutorialpath

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What is Constant in PHP

  • 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).
  • Constants are used for data that is unchanged at multiple place within our program.
  • Variables are temporary storage while Constants are permanent.

PHP constants can be defined by 2 ways:

  1. Using define() function
  2. Using const keyword

PHP constants follow the same PHP variable rules. For example, it can be started with letter or underscore only.

Conventionally, PHP constants should be defined in uppercase letters.

Syntax of constant:

Let’s see the syntax of define() function in PHP.


  1. name: specifies the constant name
  2. value: specifies the constant value
  3. case-insensitive: Default value is false. It means it is case sensitive by default.



PHP constant: const keyword

  • The const keyword defines constants at compile time. It is a language construct not a function.
  • It is bit faster than define().
  • It is always case sensitive.




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