PHP function that shuffles an associative array while preserving the key-value pairs | array_keys()

Описание: In this video, we are going to learn how to shuffle an associative array while preserving the key-value pairs. Let’s say we have two arrays: an indexed array and an associative array.

If we want to shuffle the indexed array, we can use the built-in array function shuffle() with great results. But if we want to shuffle the associative array while preserving the key-value pairs, there isn’t a built-in function to do that. If we use the shuffle() function to shuffle the associative array, the values of the associative array will be shuffled but the original named keys will be removed and replaced with indexes.

So, we have to create a custom function. We will call this function shuffle_assoc_arr(). Its argument is an associative array and its output is the same associative array but shuffled and with the key-value pairs preserved.

First, we declare the array that is going to store the key-value pairs of the original associative array, arranged in a new random order. Then, we extract the keys of the associative array and store them in an indexed array. The keys of the original associative array are the values of the new indexed array. We shuffle the new indexed array of keys, build up the new associative array and, finally, return it.

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Disclaimer: this video is meant to be a proof of concept.