How can the issue of a function not recognizing a variable like $res be addressed in PHP code?

The issue of a function not recognizing a variable like $res in PHP can be addressed by using the "global" keyword inside the function to access the variable from the global scope. This allows the function to use the variable $res within its scope. 

$res = "Hello, world!";

function myFunction() {
    global $res;
    echo $res;
}

myFunction();

Keywords

variable function PHP scope error

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