How to output php after sorting the array

PHP is a popular programming language used for developing web applications. It is very powerful in many ways, including sorting arrays. When you need to render the array elements in a specific order, you can use the PHP sort function to sort the array. This article will introduce how to sort an array and how to output the sorted results.

Array sorting

PHP provides many useful functions to sort arrays. The following are several commonly used sorting methods:

1. sort(): Sorts array elements in ascending order, retaining key names.
2. rsort(): Sort array elements in descending order, retaining key names.
3. asort(): Sorts array elements in ascending order and preserves key-value relationships.
4. arsort(): Sorts array elements in descending order and preserves key-value relationships.
5. ksort(): Sorts array elements by key name, retaining key-value relationships.
6. krsort(): Sorts array elements in descending order by key name, retaining key-value relationships.

Let’s take a look at how to use these functions to sort arrays.

Sample code

<?php
//定义一个数组
$fruits = array("apple", "orange", "banana", "grape");

//使用sort()对数组进行升序排序
sort($fruits);

//循环遍历数组，输出排序后的结果
foreach ($fruits as $key => $val) {
    echo "$key : $val"."<br>";
}
?>

Output result

0 : apple
1 : banana
2 : grape
3 : orange

In the above example, we defined a file called "$ fruits" array and sort it in ascending order using sort(). Then, use a foreach loop to iterate through the array and output the sorted results.

Now, let’s try some other sorting methods.

Sort by value in descending order

<?php
//定义一个数组
$cars = array("Volvo", "BMW", "Toyota", "Honda");

//使用rsort()将数组按降序排序
rsort($cars);

//循环遍历数组，输出排序后的结果
foreach ($cars as $key => $val) {
    echo "$key : $val"."<br>";
}
?>

Output results

0 : Volvo
1 : Toyota
2 : Honda
3 : BMW

In the above example, we use rsort() to sort the array Sort in descending order, then loop through the array and output the results.

Sort by key name

<?php
//定一个关联数组
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

//使用ksort()对数组按键名升序排序
ksort($age);

//循环遍历数组，输出排序后的结果
foreach ($age as $key => $val) {
    echo "$key : $val"."<br>";
}
?>

Output results

Ben : 37
Joe : 43
Peter : 35

In the above example, we defined an associative array, and Use ksort() to sort it by key name in ascending order. Then, use a foreach loop to iterate through the array and output the results.

The above are several basic array sorting methods. You can choose the method that suits your needs for array sorting.

Output the sorted array

Once you have sorted the array, you need to know how to output the sorted result. Here are some examples:

<?php
//定义一个数组
$fruits = array("apple", "orange", "banana", "grape");

//使用sort()对数组进行升序排序
sort($fruits);

//输出排序后的数组
print_r($fruits);
?>

Output results

Array ( [0] => apple [1] => banana [2] => grape [3] => orange )

In the above example, we use sort() to sort the array in ascending order and print_r() function to output result.

Note: You can also output an array using the var_dump() function, which will display detailed information about the array element type, key name, and value.

//输出数组信息
var_dump($fruits);

Summary

Array sorting is an integral part of PHP programming. Arrays can be sorted easily using the powerful sort functions provided by PHP. Additionally, understanding how to output a sorted array will help you make better use of your sort results.

The above is the relevant introduction and sample code of this article on "How to output PHP after sorting the array". I hope it will be helpful to you in applying what you have learned.

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