PHP Program to Sort an Array in Ascending Order
Sorting array elements is a common operation in programming. PHP provides several methods to achieve this operation. In this article, we will explore various approaches to sort array elements of an array in ascending order.
Table of Content
Using sort() Function
The sort() function is a built-in PHP function that sorts an array in ascending order.
<?php
$arr = [5, 2, 8, 3, 1];
// Sort array in ascending order
sort($arr);
// Display the sorted array
print_r($arr);
?>
Output
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 5
[4] => 8
)Using asort() Function
The asort() function is similar to sort(), but it maintains the association between keys and values.
<?php
// Associative array
$arr = ['b' => 5, 'a' => 2, 'd' => 8];
// Sort array by values in
// ascending order
asort($arr);
// Display the sorted array
print_r($arr);
?>
Output
Array
(
[a] => 2
[b] => 5
[d] => 8
)Using array_multisort() Function
The array_multisort() function is used to sort multiple arrays or a multi-dimensional array.
<?php
$names = ['John', 'Anna', 'Bob'];
$ages = [30, 25, 35];
// Sorting arrays based on the
// values in the first array
array_multisort($names, $ages);
// Displaying the sorted arrays
print_r($names);
print_r($ages);
?>
Output
Array
(
[0] => Anna
[1] => Bob
[2] => John
)
Array
(
[0] => 25
[1] => 35
[2] => 30
)Using uasort() Function with Custom Comparison Function
The uasort() function enables sorting an associative array using a user-defined comparison function.
<?php
// Associative array
$arr = ['b' => 5, 'a' => 2, 'd' => 8];
// Sort array using a custom
// comparison function
uasort($arr, function ($a, $b) {
return $a - $b;
});
// Display sorted array
print_r($arr);
?>
Output
Array
(
[a] => 2
[b] => 5
[d] => 8
)Using Custom Function
This PHP program sorts an array in ascending order using a custom Bubble Sort function. It compares and swaps adjacent elements iteratively until the array is sorted, demonstrating an alternative to built-in sorting functions.
Example:
<?php
function bubbleSort(array $array) {
$n = count($array);
for ($i = 0; $i < $n; $i++) {
for ($j = 0; $j < $n - $i - 1; $j++) {
if ($array[$j] > $array[$j + 1]) {
// Swap the elements
$temp = $array[$j];
$array[$j] = $array[$j + 1];
$array[$j + 1] = $temp;
}
}
}
return $array;
}
// Define an array
$array = [5, 2, 9, 1, 5, 6];
// Sort the array using Bubble Sort
$sortedArray = bubbleSort($array);
// Print the sorted array
print_r($sortedArray);
?>
Output
Array
(
[0] => 1
[1] => 2
[2] => 5
[3] => 5
[4] => 6
[5] => 9
)
Using ksort() Function
The ksort() function sorts an associative array by keys in ascending order, preserving key-value associations.
Example:
<?php
// Example associative array
$array = ['c' => 3, 'a' => 1, 'b' => 2];
// Sort array by keys using ksort()
ksort($array);
print_r($array); // Output: ['a' => 1, 'b' => 2, 'c' => 3]
?>
Output
Array
(
[a] => 1
[b] => 2
[c] => 3
)
