How Can I Replace PHP's Deprecated `create_function()` in PHP 7.2 and Later?

PHP 7.2 Deprecates create_function(): A Closer Look

In PHP 7.2, the creation of functions dynamically through the create_function() function has been deprecated. This poses a challenge for developers who have relied on this feature in their applications. To address this, let's explore a solution that offers a modern and compatible alternative.

Consider the following code snippet:

$callbacks[$delimiter] = create_function(
    '$matches',
    "return '$delimiter' . strtolower($matches[1]);"
);

Here, create_function() dynamically creates a function based on the provided string. However, in PHP 7.2 and later, this approach is no longer recommended.

The Alternative: Anonymous Functions (Closures)

To rewrite the code for PHP 7.2 compatibility, you can utilize Anonymous Functions, also known as Closures. Closures are anonymous functions that can be defined and used within your code. They allow you to access variables from the parent scope, making them ideal for the task at hand.

The following code demonstrates how to rewrite the original snippet using a Closure:

$callbacks[$delimiter] = function($matches) use ($delimiter) {
    return $delimiter . strtolower($matches[1]);
};

In this Closure:

• function($matches): Defines the function parameters, which are received as an array representing the matches from a regular expression.
• use ($delimiter):** Declares that the **$delimiter variable from the parent scope will be available within the closure.
• return $delimiter . strtolower($matches[1]): Returns the desired result, which is the concatenation of $delimiter and the lowercase version of the first matched element.

By employing Anonymous Functions, you can seamlessly transition your code to PHP 7.2 and beyond, maintaining the functionality provided by create_function() while adhering to the latest PHP standards.

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