Functional_sum.php

<?php

$data =  json_decode('[
    {
        "id": 1,
        "value1": 5,
        "value2": 10
    },
    {
        "id": 2,
        "value1": 50,
        "value2": 100
    },
    {
        "id": 1,
        "value1": 1,
        "value2": 2
    },
    {
        "id": 2,
        "value1": 15,
        "value2": 20
    },
    {
        "id": 3,
        "value1": 15,
        "value2": 20
    }
]');

//print_r(array_group_by($data,'id'));
print_r(array_sum_by($data,'id',['value1','value2']));
//print_r(array_sum(array_column($data,'value1')));

function array_sum_by($array,$group,$keys)
{
     $groupeddata = array_group_by($array,$group);
    return  array_map(function($items) use($group,$keys) { 

        foreach($keys as $key)
        {
            $values[$key] = array_sum(array_column($items,$key));
        }
        $first = array_shift($items);
        if(is_object( $first ) && isset( $first->{ $group } )){
            $values = array_merge([ $group => $first->{ $group } ], $values);
        }elseif(isset($first[$group])){
            $values = array_merge([ $group => $first[$group] ], $values);
        }
        return $values;
    },$groupeddata); 
}

function array_group_by( array $array, $key )
    {
        if ( ! is_string( $key ) && ! is_int( $key ) && ! is_float( $key ) && ! is_callable( $key ) ) {
            trigger_error( 'array_group_by(): The key should be a string, an integer, or a callback', E_USER_ERROR );
            return null;
        }
        $func = ( is_callable( $key ) ? $key : null );
        $_key = $key;
        // Load the new array, splitting by the target key
        $grouped = [];
        foreach ( $array as $value ) {
            if ( is_callable( $func ) ) {
                $key = call_user_func( $func, $value );
            } elseif ( is_object( $value ) && isset( $value->{ $_key } ) ) {
                $key = $value->{ $_key };
            } elseif ( isset( $value[ $_key ] ) ) {
                $key = $value[ $_key ];
            } else {
                continue;
            }
            $grouped[ $key ][] = $value;
        }
        // Recursively build a nested grouping if more parameters are supplied
        // Each grouped array value is grouped according to the next sequential key
        if ( func_num_args() > 2 ) {
            $args = func_get_args();
            foreach ( $grouped as $key => $value ) {
                $params = array_merge( [ $value ], array_slice( $args, 2, func_num_args() ) );
                $grouped[ $key ] = call_user_func_array( 'array_group_by', $params );
            }
        }
        return $grouped;
    }