What is the issue with using undefined constants in PHP and how can it be resolved?

Using undefined constants in PHP can lead to errors and warnings in your code, as PHP will assume that the constant is a string with its name. To resolve this issue, you can define the constant using the `define()` function before using it in your code. 

define('MY_CONSTANT', 'my value');

// Now you can use MY_CONSTANT in your code without any issues
echo MY_CONSTANT;

Keywords

undefined constants PHP error define constant

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