PHP Array Exercises : Sort a multi-dimensional array set by a specific key

Last update on December 20 2024 10:22:58 (UTC/GMT +8 hours)

Write a PHP program to sort a multi-dimensional array set by a specific key.

Sample Solution:

PHP Code:

<?php
// Define a function named 'column_Sort' for sorting a multi-dimensional array based on a specified column
function column_Sort($unsorted, $column) {
    // Create a copy of the unsorted array to be sorted
    $sorted = $unsorted;

    // Iterate through the array using bubble sort algorithm
    for ($i = 0; $i < sizeof($sorted) - 1; $i++) {
        for ($j = 0; $j < sizeof($sorted) - 1 - $i; $j++) {
            // Compare values in the specified column and swap if necessary
            if ($sorted[$j][$column] > $sorted[$j + 1][$column]) {
                $tmp = $sorted[$j];
                $sorted[$j] = $sorted[$j + 1];
                $sorted[$j + 1] = $tmp;
            }
        }
    }

    // Return the sorted array
    return $sorted;
}

// Initialize a multi-dimensional array $my_array with sample data
$my_array = array();
$my_array[0]['name'] = 'Sana';
$my_array[0]['email'] = '[email protected]';
$my_array[0]['phone'] = '111-111-1234';
$my_array[0]['country'] = 'USA';

$my_array[1]['name'] = 'Robin';
$my_array[1]['email'] = '[email protected]';
$my_array[1]['phone'] = '222-222-1235';
$my_array[1]['country'] = 'UK';

$my_array[2]['name'] = 'Sofia';
$my_array[2]['email'] = '[email protected]';
$my_array[2]['phone'] = '333-333-1236';
$my_array[2]['country'] = 'India';

// Print the sorted array based on the 'name' column
print_r(column_Sort($my_array, 'name'));
?>

Output:

Array                                                       
(                                                           
    [0] => Array                                            
        (                                                   
            [name] => Robin                                 
            [email] => [email protected]                    
            [phone] => 222-222-1235                         
            [country] => UK                                 
        )                                                   
                                                            
    [1] => Array                                            
        (                                                   
            [name] => Sana                                  
            [email] => [email protected]                     
            [phone] => 111-111-1234                         
            [country] => USA                                
        )                                                   
                                                            
    [2] => Array                                            
        (                                                   
            [name] => Sofia                                 
            [email] => [email protected]                    
            [phone] => 333-333-1236                         
            [country] => India                              
        )                                                   
                                                            
)

Flowchart:

PHP Code Editor:

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