﻿ PHP Array Exercise: Difference of two multidimensional arrays - w3resource

# 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 to compare keys for array_diff_uassoc
function key_compare(\$a, \$b)
{
// If keys are identical, return 0
if (\$a === \$b)
return 0;

// Return 1 if \$a is greater than \$b, otherwise return -1
return (\$a > \$b) ? 1 : -1;
}

// Function to find the difference between two multidimensional arrays based on associative keys
function multidimensional_array_diff(\$arr1, \$arr2)
{
// Use array_diff_uassoc to find the difference based on the provided key_compare function
return array_diff_uassoc(\$arr1['c'], \$arr2['c'], "key_compare");
}

// Two multidimensional 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 the difference between the multidimensional arrays
print_r(multidimensional_array_diff(\$color1, \$color2));

?>
```
```

Output:

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

Flowchart:

PHP Code Editor: