How can the issue of undefined variables within functions be addressed in PHP?

When dealing with undefined variables within functions in PHP, it is important to initialize variables within the function or check if they are set before using them to avoid errors. One way to address this issue is by using the isset() function to check if a variable is set before using it in the function. 

function exampleFunction() {
    $var1 = isset($var1) ? $var1 : '';
    // continue with the function logic using $var1
}

Keywords

undefined variables functions error handling isset PHP

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