PHP Function for Comparing Elements in Different Arrays

Question

I have two arrays like so (however there can be more or less than 2 (any amount)):

[0] => Array
    (
        [assessedUsers] => Array
            (
                [0] => Array
                    (
                        [scores] => Array
                            (
                                [0] => 10
                                [1] => 10
                                [2] => 10
                                [3] => 10
                            )

                    )

                [1] => Array
                    (
                        [scores] => Array
                            (
                                [0] => 9
                                [1] => 10
                                [2] => 0
                                [3] => 9
                            )

                    )
            )
    )

Where the length of the scores array is always the same in both arrays.

I would like to take each element from each array, one by one, and average them, then append them into a new array.

For example, the output of my desired function would look like this:

[1] => Array
    (
        [scores] => Array
            (
                [0] => 9.5
                [1] => 10
                [2] => 5
                [3] => 9.5
            )

    )

Is there a function that can do this, or do I need a couple nested for() loops? If I need to use forl loops how would I go about doing it? I'm a little confused on the logic behind it.

Currently what I have is:

for ($i = 0; $i < sizeof($data["assessedUsers"]); $i++) {
    for ($j = 0; $j < sizeof($data["assessedUsers"][$i]["scores"]); $j++) {

    }
}

and I'm a little confused as to what to where to go next. Thanks in advance!

You need some loops.

u_mulder
– u_mulder

2014-10-08 19:25:52 +00:00
Commented Oct 8, 2014 at 19:25 — u_mulder
– u_mulder, Commented Oct 8, 2014 at 19:25
Do you have only two array or there might be more?

Cheery
– Cheery

2014-10-08 19:45:08 +00:00
Commented Oct 8, 2014 at 19:45 — Cheery
– Cheery, Commented Oct 8, 2014 at 19:45
There could and will be more.

php
– php

2014-10-08 19:47:11 +00:00
Commented Oct 8, 2014 at 19:47 — php
– php, Commented Oct 8, 2014 at 19:47
@php than you should state it in your question

Cheery
– Cheery

2014-10-08 19:47:45 +00:00
Commented Oct 8, 2014 at 19:47 — Cheery
– Cheery, Commented Oct 8, 2014 at 19:47

Cheery · Accepted Answer · 2014-10-08 20:27:48Z

1

$mean = array_map( function($a, $b) { return ($a + $b) / 2; },
          $data['assessedUsers'][0]['scores'],
          $data['assessedUsers'][1]['scores']
        );

var_dump($mean);

And append $mean anywhere you want. Or do you have more than 2 arrays? You did not state it in your question.

ps: for any number of subarrays

$arr = array(
   array('scores' => array(10,10,10,10)),
   array('scores' => array(9,10,0,9)),
   array('scores' => array(1,2,3,4))
);

// remove arrays from the key
$tmp = call_user_func_array( function() { return func_get_args(); }, 
  array_map( function($a) { return $a['scores']; }, $arr)
);

// add arrays by each element
$mean = array_map( function($val, $ind) use($tmp) {
    $sum = 0;
    foreach($tmp as $i => $t)
       $sum += $t[$ind];
    return $sum / ($i + 1); 
}, $tmp[0], array_keys($tmp[0]));

var_dump($mean);

edited Oct 8, 2014 at 20:27

answered Oct 8, 2014 at 19:35

Cheery

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3 Comments

Cheery Over a year ago

@php there is no 500.. only if you are using a very old php. what version do you have?

php Over a year ago

There also can be more than 2 arrays.

php Over a year ago

Well there is haha. I'm looking at the error right now. It's through Ajax.

Marc B · Accepted Answer · 2014-10-08 19:33:19Z

0

Probably two loops:

$newarray();

foreach($main_array as $user) {
   foreach($user['assessedUser'][0]['scores'] as $score_key => $user0_value) {
           $user1_value = $user['assessedUser'][1]['scores'][$score_key];
           $average = ($user1_value + $user0_value) / 2;
           ... stuff into new array
   }
}

answered Oct 8, 2014 at 19:33

Marc B

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1 Comment

php Over a year ago

There will be more than two arrays. I don't know what the length is.

HoangHieu · Accepted Answer · 2014-10-08 20:06:44Z

0

I have solution for you, hope this help :)

$scores = array();

for ($i = 0; $i < sizeof($data["assessedUsers"]); $i++) {       
    for ($j = 0; $j < sizeof($data["assessedUsers"][$i]["scores"]); $j++) {
        if(isset($scores[$j])){
            $scores[$j] = ($scores[$j] + $data["assessedUsers"][$i]["scores"][$j]) / ($i +1);
        }else{
            $scores[] = $data["assessedUsers"][$i]["scores"][$j];
        }
    }
}

$scores[] = $scores;

view Example :) http://codepad.org/upPjMEym

edited Oct 8, 2014 at 20:06

answered Oct 8, 2014 at 19:40

HoangHieu

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12 Comments

php Over a year ago

500 internal server error. I don't think some of that is proper PHP syntax.

HoangHieu Over a year ago

check Array(); or array() check update answer

php Over a year ago

Pretty sure it's not only that it should be $scores = array(); but it shouldn't be $scores[], because I'm still getting 500 internal server error.

HoangHieu Over a year ago

I don't have any IDE for php, so i thing error in $scores = array(); replace Array() to array()

HoangHieu Over a year ago

this / $i +1 change to /($i +1) this error when $i = 0;

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