Comparing & Counting Matched Values of Two Associative Arrays - PHP

Question

I have been researching comparing two associative arrays, which I have only been able to do with a fair degree of accuracy. I have read all similar threads on SO but none have solved or addressed the issue I am having, which is, while comparing two associative arrays the test data will successfully show the appropriate matches, however when I attempt to count the number of matched values, I am getting some strange results.

EDIT:

<?php
$data    = array(
    'Alpha' => array(
        'peace' => 0,
        'art' => 1,
        'trend' => 0,
        'night' => 1,
        'shop' => 0
    ),
    'Beta' => array(
        'peace' => 1,
        'art' => 1,
        'trend' => 1,
        'night' => 1,
        'shop' => 0
    ),
    'Gamma' => array(
        'peace' => 0,
        'art' => 1,
        'trend' => 1,
        'night' => 1,
        'shop' => 0
    )
);
$choices = array(
    'peace' => 0,
    'art' => 1,
    'trend' => 0,
    'night' => 1,
    'shop' => 0
);
function compare($data, $choices)
{
    foreach ($data as $city => $name)
    {
        echo $city . '<br>';
        foreach ($name as $key => $value)
        {
            ($choices[$key] === $value) ? $match = 'match' : $match = 'no';
            ($choices[$key] === $value) ? $i++ : $i = 0;
            echo $key . ':' . $value . ':' . $choices[$key] . ':' . $match . '<br>';
        }
        echo 'Matches:' . $i . '<br><br>';
    }
}
compare($data, $choices);
?>

OUTPUT DATA

Format of data is as follows
-----------------------------
name of key:$data value:$choices value:is match

Alpha
peace:0:0:match
art:1:1:match
trend:0:0:match
night:1:1:match
shop:0:0:match
Matches:5

Beta
peace:1:0:no
art:1:1:match
trend:1:0:no
night:1:1:match
shop:0:0:match
Matches:2

Gamma
peace:0:0:match
art:1:1:match
trend:1:0:no
night:1:1:match
shop:0:0:match
Matches:2

'Alpha' should return 5 matches, which it does. 'Beta' should return 3, it returns 2. 'Gamma' should return 4, it returns 2.

Any help would be greatly appreciated. Thank you in advance.

Answer 1

The problem is how you are incrementing the count with a ternary statement. When you do

($choices[$key] === $value) ? $i++ : $i = 0;

It will reset $i to zero any time it encounters a non-match.

Using a simple conditional instead should give you the correct count.

if ($choices[$key] === $value) $i++;

You can initialize $i to 0 before the inner foreach loop.