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:

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.

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