How to merge PHP arrays with matching keys and combine their values?

PHP Array: Merging Arrays with Matching Keys

In PHP, there are instances when we need to merge multiple arrays, ensuring that items with the same key are combined. Consider the following scenario:

Problem:

We have two arrays with matching keys and wish to merge them, such as:

<code class="php">$array1 = [
    ['Camera1' => '192.168.101.71'],
    ['Camera2' => '192.168.101.72'],
    ['Camera3' => '192.168.101.74']
];

$array2 = [
    ['Camera1' => 'VT'],
    ['Camera2' => 'UB'],
    ['Camera3' => 'FX']
];</code>

Solution:

To merge these arrays while preserving the key-value relationship, we can use array_map in conjunction with array_keys to manipulate and combine them:

<code class="php">$results = array();

array_map(function($a, $b) use (&$results) {

    $key1 = current(array_keys($a));
    $a[$key1] = ['ip' => $a[$key1]];

    $key2 = current(array_keys($b));
    $b[$key2] = ['name' => $b[$key2]];

    $results = array_merge_recursive($a, $b);

}, $array1, $array2);</code>

This solution works by looping through each element in both arrays, extracting the corresponding key, and renaming the values to ensure they can be merged using array_merge_recursive. The result is an array where each key has a merged result, as shown below:

<code class="php">array (
  'Camera1' => array (
    'ip' => '192.168.101.71',
    'name' => 'VT'
  ),
  'Camera2' => array (
    'ip' => '192.168.101.72',
    'name' => 'UB'
  ),
  'Camera3' => array (
    'ip' => '192.168.101.74',
    'name' => 'FX'
  )
)</code>

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