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PHP Array Merge on Same Key: A Solution Using array_map
In PHP, merging arrays can be challenging when the arrays share common keys. Let's address this problem with a solution that leverages the array_map function.
Objective:
Merge two arrays, $array1 and $array2, based on shared keys (e.g., "Camera1", "Camera2"), and ensure the merged result maintains the desired structure.
Solution:
array_map offers a way to iterate over multiple arrays simultaneously, applying a callback function to each element. Here's how we can use it:
<code class="php">$array1 = [ ["Camera1" => "192.168.101.71"], ["Camera2" => "192.168.101.72"], ["Camera3" => "192.168.101.74"] ]; $array2 = [ ["Camera1" => "VT"], ["Camera2" => "UB"], ["Camera3" => "FX"] ]; $results = []; array_map(function($a, $b) use (&$results) { // Get the key for both arrays $key = current(array_keys($a)); $a[$key] = ['ip' => $a[$key]]; $key = current(array_keys($b)); $b[$key] = ['name' => $b[$key]]; $results += array_merge_recursive($a, $b); }, $array1, $array2);</code>
How It Works:
Output:
var_dump($results);
Will produce the following output:
<code class="php">array (size=3) 'Camera1' => array (size=2) 'ip' => string '192.168.101.71' (length=14) 'name' => string 'VT' (length=2) 'Camera2' => array (size=2) 'ip' => string '192.168.101.72' (length=14) 'name' => string 'UB' (length=2) 'Camera3' => array (size=2) 'ip' => string '192.168.101.74' (length=14) 'name' => string 'FX' (length=2)</code>
This solution effectively merges the two arrays while preserving the shared keys and ensuring the desired array structure.
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