Asked  2 Years ago    Answers:  5   Viewed   81 times

I got a multidimensional array like this:

Totalarray
(
[0] => Array
    (
        [city] => NewYork
        [cash] => 1000
    )

[1] => Array
    (
        [city] => Philadelphia
        [cash] => 2300
    )

[2] => Array
    (
        [city] => NewYork
        [cash] => 2000
    )
)

and I'd like to sum the value [cash] of the sub-arrays who got the same value[city] and obtain an array like this:

Totalarray
(
[0] => Array
    (
        [city] => NewYork
        [cash] => 3000
    )

[1] => Array
    (
        [city] => Philadelphia
        [cash] => 2300
    )
)

How can I do it?

 Answers

2

Try below code:

<?php

$arr = array(
        array('city' => 'NewYork', 'cash' => '1000'),
        array('city' => 'Philadelphia', 'cash' => '2300'),
        array('city' => 'NewYork', 'cash' => '2000'),
    );

$newarray = array();
foreach($arr as $ar)
{
    foreach($ar as $k => $v)
    {
        if(array_key_exists($v, $newarray))
            $newarray[$v]['cash'] = $newarray[$v]['cash'] + $ar['cash'];
        else if($k == 'city')
            $newarray[$v] = $ar;
    }
}

print_r($newarray);


Output:

Array
(
    [NewYork] => Array
        (
            [city] => NewYork
            [cash] => 3000
        )

    [Philadelphia] => Array
        (
            [city] => Philadelphia
            [cash] => 2300
        )

)


Demo:
http://3v4l.org/D8PME

Saturday, August 6, 2022
3
function set_val(array &$arr, $path,$val)
{
   $loc = &$arr;
   foreach(explode('.', $path) as $step)
   {
     $loc = &$loc[$step];
   }
   return $loc = $val;
}
Monday, August 8, 2022
 
coldy
 
5

I am not sure if this will be useful. I have noticed that the ArrayObject class is 'interesting'...

I am not sure that this is even an 'answer'. It is more an observation about this class.

It handles the 'multidimensional array' stuff correctly as standard.

You may be able to add methods to make it do more of what you wish?

<?php //

class Config extends ArrayObject
{

//    private $data = array();

    public function __construct(array $data = array())
    {
        parent::__construct($data);
    }
}

$conf = new Config(array('a' => 'foo', 'b' => 'bar', 'c' => array('sub' => 'baz')));
$conf['c']['sub'] = 'notbaz';
$conf['c']['sub2'] = 'notbaz2';

var_dump($conf, $conf['c'], $conf['c']['sub']);

unset($conf['c']['sub']);

var_dump('isset?: ', isset($conf['c']['sub']));

var_dump($conf, $conf['c'], $conf['c']['sub2']);

Output:

object(Config)[1]
  public 'a' => string 'foo' (length=3)
  public 'b' => string 'bar' (length=3)
  public 'c' => 
    array
      'sub' => string 'notbaz' (length=6)
      'sub2' => string 'notbaz2' (length=7)

array
  'sub' => string 'notbaz' (length=6)
  'sub2' => string 'notbaz2' (length=7)

string 'notbaz' (length=6)

string 'isset?: ' (length=8)

boolean false

object(Config)[1]
  public 'a' => string 'foo' (length=3)
  public 'b' => string 'bar' (length=3)
  public 'c' => 
    array
      'sub2' => string 'notbaz2' (length=7)

array
  'sub2' => string 'notbaz2' (length=7)

string 'notbaz2' (length=7)
Sunday, October 2, 2022
 
k_ride
 
2

Very similar to a couple of questions I answered last night:

$a1 = array(
"a" => "1",
"b" => "2",
"c" => "3"
);

$a2 = array(
"d" => "4",
"e" => "5",
"f" => "6"
);

$a3 = array(
"g" => "7",
"h" => "8",
"i" => "9"
);

$x = array_combine(
    $a1,
    call_user_func_array('array_map', [null, $a2, $a3])
);
var_dump($x);
Sunday, December 4, 2022
 
4

Simply you can write a function like this with recursion

function arrSum(arr) {
  var sum = 0;
  // iterate array using forEach, better to use for loop since it have higher performance
  arr.forEach(function(v) {
    // checking array element is an array
    if (typeof v == 'object')
      // if array then getting sum it's element (recursion)
      sum += arrSum(v);
    else
      // else adding the value with sum
      sum += v
  })
  // returning the result
  return sum;
}

console.log(arrSum([2, 5, [4, 6], 5]) === 22);

Using for loop

function arrSum(arr) {
  var sum = 0;
  for (var i = 0; i < arr.length; i++) {
    if (typeof arr[i] == 'object')
      sum += arrSum(arr[i]);
    else
      sum += arr[i];
  }
  return sum;
}

console.log(arrSum([2, 5, [4, 6], 5]) === 22);
Tuesday, September 13, 2022
 
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