Web Reference: PHP Constants Constants are like variables, except that once they are defined they cannot be changed or undefined. PHP constants can be defined with the define() function or the const keyword. A valid constant name starts with a letter or underscore (no $ sign before the constant name). 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. Apr 11, 2025 · A constant is a name or identifier used to store a fixed value that does not change during the execution of a PHP script. Unlike variables, constants do not start with a $ symbol and stay the same once they are defined.
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