Merge and group by several arrays

Question

I need to merge associative arrays and group by the name. Say I have such 3 arrays:

ARRAY1
    \"/path/file.jpg\"  =>  2, 
    \"/path/file2.bmp\" =>  1,
          


        

Answer 1

You can use a RecursiveArrayIterator

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($paths));
foreach ($iterator as $path => $value) {
    $summed[$path] = isset($summed[$path]) ? $summed[$path] + $value : $value;
}
print_r($summed);

or array_walk_recursive and a Closure

$summed = array();
array_walk_recursive($paths, function($value, $path) use (&$summed) {
    $summed[$path] = isset($summed[$path]) ? $summed[$path] + $value : $value;
});

Both will give

Array
(
    [/path/file.jpg] => 4
    [/path/file2.bmp] => 3
    [/file3.gif] => 5
)