How can the use of undefined constants in PHP code be avoided to prevent errors like the ones experienced by the user in the thread?

To avoid errors caused by undefined constants in PHP code, it is important to define constants using the `define()` function before using them in the code. This ensures that the constants have a value assigned to them before they are referenced, preventing any undefined constant errors from occurring. 

define('MY_CONSTANT', 'my_value');

// Using the defined constant
echo MY_CONSTANT;

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undefined constants PHP code errors prevention thread

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