Web Reference: 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 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). In this tutorial, you learn about PHP constants and how to use them in your script effectively.
YouTube Excerpt: PHP Constants
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Php Tutorial 3 Php Constants Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 7, 2026
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