Deprecation of create_function() in PHP

As of PHP 7.2.0, the create_function() function has been deprecated. This function was used to create anonymous functions, also known as closures, which are functions without a specified name.

Instead of create_function(), developers are advised to use a more modern syntax for creating anonymous functions using the function() keyword. This syntax offers more features and better performance than the deprecated function.

Here is an example of how to use the function() syntax to create an anonymous function:

$double = function($num) {
    return $num * 2;
};

echo $double(5); // Outputs 10

In this example, we are assigning an anonymous function to the variable $double. The function takes a parameter $num and returns twice its value. We can then call this function by passing the argument 5 and it will return 10.

This is just one example of how to use anonymous functions in PHP. They are a powerful feature that allow developers to write more concise and modular code.

So if you are still using create_function(), it's time to update your code to use the newer function() syntax. Your code will be more efficient and easier to read and maintain.