What is the method of sorting one-dimensional array in php

In PHP, arrays are a very common data type, and we often need to sort arrays. In actual development, we most commonly use one-dimensional arrays. There are many ways to sort one-dimensional arrays. Here are some common sorting methods.

1. sort() function

PHP’s built-in function sort() can sort a one-dimensional array in ascending order. The usage method is as follows:

$arr = array(3, 5, 1, 2, 4);
sort($arr);
print_r($arr);

The output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

2. rsort() function

rsort() function is similar to sort() function, except that it is based on Sort a one-dimensional array in descending order. The code is as follows:

$arr = array(3, 5, 1, 2, 4);
rsort($arr);
print_r($arr);

The output result is:

Array
(
    [0] => 5
    [1] => 4
    [2] => 3
    [3] => 2
    [4] => 1
)

3. asort() function

asort() function sorts the array in ascending order and retains the original key values. The usage is as follows:

$arr = array("apple" => 3, "orange" => 5, "banana" => 1, "grape" => 2, "peach" => 4);
asort($arr);
print_r($arr);

The output result is:

Array
(
    [banana] => 1
    [grape] => 2
    [apple] => 3
    [peach] => 4
    [orange] => 5
)

4. arsort() function

The arsort() function sorts the array in descending order and retains the original key values. . The code is as follows:

$arr = array("apple" => 3, "orange" => 5, "banana" => 1, "grape" => 2, "peach" => 4);
arsort($arr);
print_r($arr);

The output result is:

Array
(
    [orange] => 5
    [peach] => 4
    [apple] => 3
    [grape] => 2
    [banana] => 1
)

5. ksort() function

ksort() function sorts the array in ascending order by key name. The usage method is as follows:

$arr = array("apple" => 3, "orange" => 5, "banana" => 1, "grape" => 2, "peach" => 4);
ksort($arr);
print_r($arr);

The output result is:

Array
(
    [apple] => 3
    [banana] => 1
    [grape] => 2
    [orange] => 5
    [peach] => 4
)

6. krsort() function

krsort() function sorts the array in descending order by key name. The code is as follows:

$arr = array("apple" => 3, "orange" => 5, "banana" => 1, "grape" => 2, "peach" => 4);
krsort($arr);
print_r($arr);

The output result is:

Array
(
    [peach] => 4
    [orange] => 5
    [grape] => 2
    [banana] => 1
    [apple] => 3
)

Summary

The above is the sorting method of one-dimensional arrays in PHP. Each function has a different role. We can Choose different sorting methods according to actual needs.

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