How to use usort() Function with Custom Comparison Function In PHP
The usort() function allows you to sort an array using a user-defined comparison function. By using a comparison function that returns a random value, you can achieve array randomization.
PHP
<?php $arr = [1, 2, 3, 4, 5]; // Randomize the order of the array usort($arr, function () { return rand(-1, 1); }); // Display the randomized array print_r($arr); ?> |
Output
Array
(
[0] => 2
[1] => 1
[2] => 3
[3] => 4
[4] => 5
)
How to Randomize the Order of an Array in PHP ?
Randomizing the order of an array is a common operation in PHP, especially when dealing with datasets or when you want to shuffle the presentation of items. In this article, we will explore various approaches to randomize the order of an array.
Table of Content
- Using shuffle() Function
- Using usort() Function with Custom Comparison Function