A brief analysis of how to sort integer arrays through PHP classes

Object-oriented is a core knowledge point in PHP, and "class" is also an important concept, so in "Teach you to use a PHP class to implement addition, subtraction, multiplication and division between two numbers" , we have briefly introduced its concept and use to you. This article continues to explain the use of PHP classes.

As you can tell from the title, this time we are going to talk about how to write a PHP class to sort an integer array. In fact, there are several built-in functions in PHP that can directly sort arrays, respectively. Yes sort() Sorts the array in ascending order, rsort() Sorts the array in descending order, asort() Sorts the associative array in ascending order based on value , ksort() Sorts associative arrays in ascending order based on keys, arsort() Sorts associative arrays in descending order based on values, and krsort() Sorts an associative array in descending order based on key.

Regarding these functions, you can directly learn and understand them through the "PHP Array Sorting" chapter in the manual.

Let’s start by focusing on the implementation method of a class that can sort arrays:

The code is as follows:

<?php
class array_sort
{
    protected $_asort;

    public function __construct(array $asort)
    {
        $this->_asort = $asort;
    }
    public function alhsort()
    {
        $sorted = $this->_asort;
        sort($sorted);
        return $sorted;
    }
}
$sortarray = new array_sort(array(11, -2, 4, 35, 0, 8, -9));
var_dump($sortarray->alhsort());

Let’s run the file directly to view the sorting results:

It can be seen that the values ​​​​are sorted from small to large.

In the above code, we use the class keyword to define a class named "array_sort", and then initialize the object through the constructor method. There is a keyword protected that needs to be mentioned here, which means that protected class members can be accessed by itself and its subclasses and parent classes.

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