Online PHP editor | refs for e6V3Y

<?php $array=[ ['day'=>'11','movements'=>'1'], ['day'=>'11','movements'=>'1'], ['day'=>'11','movements'=>'1'], ['day'=>'12','movements'=>'1'], ['day'=>'12','movements'=>'1'], ['day'=>'12','movements'=>'1'] ]; foreach($array as $row){ // iterate all rows if(!isset($result[$row['day']])){ // if first occurrence of day... $result[$row['day']]=$row; // save the full row with day as the temporary key }else{ // if not the first occurrence of day... $result[$row['day']]['movements']+=$row['movements']; // add movements value } } var_export(array_values($result));