How to sort array in PHP?

There are four functions for associative arrays — you either array sort PHP by key or by value. To PHP sort array by key, you should use ksort () (for ascending order) or krsort () (for descending order). To PHP sort array by value, you will need functions asort () and arsort () (for ascending and descending orders).

How to sort an array using heap sort?

The code snippet demonstrating this is given as follows. The function heapSort () of sorts the array elements using heap sort. It starts from the non-leaf nodes and calls the heapify () on each of them. This converts the array into a binary max heap. This is shown as follows −

Why is uasort not called in PHP?

Prior to PHP 8.0.0, their order were undefined (the sorting was not stable). While this may seem obvious, user-defined array sorting functions ( uksort (), uasort (), usort () ) will *not* be called if the array does not have *at least two values in it*.

What is the Order of a sort function?

The order of the sort: alphabetical, ascending (low to high), descending (high to low), natural, random, or user defined Note: All of these sort functions act directly on the array variable itself, as opposed to returning a new sorted array If any of these sort functions evaluates two members as equal then they retain their original order.