How can the issue of PHP constants not being recognized be related to variable scope in PHP?

When PHP constants are not being recognized, it may be due to the scope in which they are defined. Constants in PHP are global by default, but if they are defined within a function or a class, they need to be accessed using the `const` keyword within that scope. To resolve this issue, ensure that constants are defined in a global scope or accessed correctly within the appropriate scope. 

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

function testFunction() {
    echo MY_CONSTANT; // This will not work
    echo const('MY_CONSTANT'); // This will work
}

testFunction();

Keywords

PHP constants variable scope global keyword define() constant()

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