What is the significance of the error message "Function create_function() is deprecated" in PHP?

The error message "Function create_function() is deprecated" in PHP indicates that the create_function() function is no longer recommended for use as it has been deprecated in newer PHP versions. To solve this issue, you should refactor your code to use anonymous functions instead of create_function(). 

// Refactored code using anonymous functions
$func = function($param) {
    return $param * 2;
};

// Example usage of the anonymous function
echo $func(5); // Output: 10

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create_function deprecated error message PHP significance

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