Online PHP editor | output for 4uGHA

<?php $array = Array ( 0 => Array ( 'id' => 1, 'column2' => 'value2', 'column3' => 'value3', 'column4' => 'value4', 'column5' => 'value5' ), 1 => Array ( 'id' => 1, 'column2' => 'value2', 'column3' => 'value3', 'column4' => 'value4', 'column5' => 'value5' ), 2 => Array ( 'id' => 2, 'column2' => 'value2', 'column3' => 'value3', 'column4' => 'value4', 'column5' => 'value5' ), ); $keys = array_keys(array_column($array, 'id'), 3); //$new_array = array_map(function($k) use ($array){return $array[$k];}, $keys); print_r($keys);