How can undefined constant errors be resolved in PHP scripts?

Undefined constant errors in PHP scripts can be resolved by ensuring that the constant being referenced is defined before it is used. This can be done by using the define() function to create the constant with a specific value. If the constant is defined in an external file, make sure to include or require that file before referencing the constant in your script. 

define('MY_CONSTANT', 'Hello World');

echo MY_CONSTANT;

Keywords

PHP constant error define syntax error

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