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PHP Array Exercises : Difference of two multidimensional arrays

PHP Array: Exercise-57 with Solution

Write a PHP function to compares two multidimensional arrays and returns the difference.

Sample Solution:

PHP Code:

<?php
function key_compare($a,$b)
{
    if($a===$b)        
    return 0;
    return($a>$b)?1:-1;
}
function multidimenssional_array_diff($arr1, $arr2)
{
return array_diff_uassoc($arr1['c'], $arr2['c'],"key_compare");
}
//multidimenssional arrays
$color1=array('a'=>'White','b'=>'Red','c'=>array('a'=>'Green','b'=>'Blue','c'=>'Yellow'));
$color2=array('a'=>'White','b'=>'Red','c'=>array('a'=>'White','b'=>'Red','c'=>'Yellow'));
print_r(multidimenssional_array_diff($color1, $color2));
?>

Sample Output: 

Array                                                       
(                                                           
    [a] => Green                                            
    [b] => Blue                                             
)

Flowchart:

Flowchart: PHP - Compares two multidimensional arrays and returns the difference

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP script to create a two-dimensional array (4x4), initialized to 10.
Next: Write a PHP script to combine (using one array for keys and another for its values) the specified two arrays.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC