Get specific number in array?!

PHP
1

I have an array looking like this:

Array
(
    [0] => 1,g,10,97
    [1] => 2,j,0,106
    [2] => 3,b,3,32
    [3] => 4,b,9,44
    [4] => 5,r,11,21
    [5] => 6,y,7,66
    [6] => 7,y,1,54
    [7] => 8,b,4,33
    [8] => 15,y,12,75
    [9] => 16,g,7,92
    [10] => 17,y,3,58
    [11] => 18,b,8,41
    [12] => 19,b,13,51
    [13] => 20,r,5,9
    [14] => 21,g,5,88
    [15] => 22,y,4,59
)

Now, I only want add the numbers after the second comma in each record together… How do I do so?

Please help and thanks in advance :slight_smile:

2

Please post the code you have so far

3

Well, I have this comma seperated string:

$str = '1,g,10,97,2,j,0,106,3,b,3,32,4,b,9,44,5,r,11,21,6,y,7,66,7,y,1,54,8,b,4,33,15,y,12,75,16,g,7,92,17,y,3,58,18,b,8,41,19,b,13,51,20,r,5,9,21,g,5,88,22,y,4,59';

I then explode this into an array like this:

$str = explode(",",$str);
$h = '';
$k = 0;
foreach($str as $value){
    $h .= ($k%4 == 3)?$value.';':$value.',';
    $k++;
}
$str = explode(";",substr($h,0,-1));

Thats it!

4

And that code gives you the array you posted in your first post.
I must say I don’t understand at all why you want an array like that, but anyway, you can:

  • add some code in the foreach you already have, to take every third element and add those together
    or
  • loop through the array in your first post, explode each row, and then take the third element and add them together.
5

But I’m not quite sure how to do so?

6

Try. Then if you can’t get it to work, post the code here and surely we can get you on the right track

7

Tryid this:

foreach($str as $result){
			$result = explode(',', $result, 2);
			echo $result.'<br>';
		}

THis gives an output like this:
Array
Array
Arra
…

Where to go from here?

8

An alternative way would be to use array functions to split the string into an array of arrays, each sub-array having four values, then sum the third value of each of those sub-arrays.


// Converts "1,2,3,4,5,6,7,8,9,10,11,12" to array(array("1","2","3","4"),array("5","6","7","8"),array("9","10","11","12"))
$arrays = array_chunk(explode(',', $str), 4);

// Pull out the third values to get array("3", "7", "11")
// Note: Requires PHP >= 5.3 for the anonymous function; could use create_function() or a loop for older PHP versions
$values = array_map(function($array){ return $array[2]; }, $arrays);

echo array_sum($values);

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