PHP function Exercises: Sort an array

Last update on May 31 2025 12:57:43 (UTC/GMT +8 hours)

4. Array Sorting

Write a PHP function to sort an array.

Visual Presentation:

Sample Salution:

PHP Code:

<?php
// Function to sort an array in ascending order
function array_sort($a)
{
 // Iterate through each element of the array
 for ($x = 0; $x < count($a); ++$x) { // Assume the current element is the minimum $min = $x; // Iterate through the remaining elements of the array for ($y = $x + 1; $y < count($a); ++$y) { // If a smaller element is found, update the minimum index if ($a[$y] < $a[$min]) { $temp = $a[$min]; $a[$min] = $a[$y]; $a[$y] = $temp; } } } // Return the sorted array return $a; } // Input array $a = array(51, 14, 1, 21, 'hj'); // Call the array_sort function with the input array and print the sorted array print_r(array_sort($a)); ?> 

Output:

Array 
( 
 [0] => hj 
 [1] => 1 
 [2] => 14 
 [3] => 21 
 [4] => 51 
) 

Explanation:

In the exercise above,

• The function "array_sort()" is defined, which takes an array '$a' as input.
• It iterates through each array element using a for loop, starting from the first element.
• Inside the outer loop, another inner loop is used to find the minimum element among the unsorted elements.
• The index of the minimum element is stored in the variable '$min'.
• If a smaller element is found in the inner loop, it swaps the positions of the current minimum element and the new minimum element.
• After completing the inner loop, the minimum element is placed in its correct position in the array.
• This process continues until the entire array is sorted.
• Finally, the sorted array is returned.

Flowchart :

For more Practice: Solve these Related Problems:

• Write a PHP function to implement the bubble sort algorithm on an array of integers and output the number of passes it took to sort the array.
• Write a PHP script to sort an array of strings in natural case-insensitive order without using built-in sorting functions.
• Write a PHP function to perform a quicksort on an array and then compare its efficiency with merge sort on the same dataset.
• Write a PHP program that sorts an associative array by its values using a custom comparison function and preserves the keys.

Go to:

• PHP Functions Exercises Home ↩
• PHP Exercises Home ↩

PREV : String Reversal.
NEXT : Check All Lowercase String.

PHP Code Editor:

Click to Open Editor

Have another way to solve this solution? Contribute your code (and comments) through Disqus.