Online PHP editor | refs for GW8m0

<?php $array = Array ( Array ( 'sexo_edad' => 'type1', 'fans' => 2 ), Array ( 'sexo_edad' => 'type2', 'fans' => 3 ), Array ( 'sexo_edad' => 'type1', 'fans' => 8 ), Array ( 'sexo_edad' => 'type2', 'fans' => 10 ) ); $type_values = array(); foreach ($array as &$arr) { if (isset($type_values[$arr['sexo_edad']])) { $arr['difference'] = $arr['fans'] - $type_values[$arr['sexo_edad']]; } else { $arr['difference'] = 0; } $type_values[$arr['sexo_edad']] = $arr['fans']; } print_r($array);