How can the use of anonymous functions in PHP code, which may require PHP 5.3 or higher, lead to compatibility issues when running the code on servers with older PHP versions like 5.2.6?

When using anonymous functions in PHP code that require PHP 5.3 or higher, compatibility issues may arise when running the code on servers with older PHP versions like 5.2.6. To solve this issue, you can refactor the anonymous functions into named functions or use a library like "nikic/php-parser" to parse and transform the code dynamically before execution.

// Refactor anonymous function into a named function
function myFunction($param) {
    return $param * 2;
}

// Use the named function instead of an anonymous function
echo myFunction(5); // Output: 10