How can different PHP versions cause undefined variable errors in XAMPP and how can they be resolved?

Different PHP versions can cause undefined variable errors in XAMPP due to changes in how variables are initialized or scoped. To resolve this issue, ensure that all variables are properly initialized before use, and use isset() or empty() functions to check if a variable is defined before accessing it. 

// Example code snippet to resolve undefined variable error
$variable = ""; // Initialize variable

if(isset($variable)) {
    // Use the variable safely
    echo $variable;
}

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