How can constants be defined and utilized in PHP to avoid undefined constant errors?

To define and utilize constants in PHP to avoid undefined constant errors, you can use the `define()` function to create a constant with a specific name and value. This ensures that the constant is always defined and can be accessed throughout your code without the risk of undefined constant errors. 

// Define a constant
define('MY_CONSTANT', 'Hello, World!');

// Utilize the constant
echo MY_CONSTANT;

Keywords

constants define utilize PHP undefined constant errors

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