Merging two multidimensional arrays on specific key

Question

Let\'s say I have following arrays:

Array
    (
        [0] => Array
            (
                [id] => 5
                [name] => Education
            


        

Answer 1

Do not use foreach in foreach,that might be too slow when the array so big.

$idArray = array_column($secondArray,'title','id');
foreach($firstArray as $key => $val){
  $firstArray[$key]['title'] = (isset($idArray[$val['id']])) ? $idArray[$val['id']] : 'some title';
}