CODEWITHSUNDEEP
phparraysrecursionmultidimensional-arrayarray-difference
code-8
code-8

Reputation: 58662

Find differences between two multidimensional arrays recursively with strict type checking

I have 2 arrays

$cpe array info

array:23 [▼
  "cpe_mac" => "298639133839"
  "bandwidth_max_up" => 30000
  "bandwidth_max_down" => 50000
  "filter_icmp_inbound" => true
  "dmz_enabled" => false
  "dmz_host" => "http:\/\/ddd.com"
  "vlan_id" => 2
  "dns" => array:2 [▶]
  "xdns_mode" => 0
  "cfprofileid" => 11111
  "stub_response" => "0"
  "acl_mode" => 1
  "portal_url" => "http:\/\/portal.com"
  "fullbandwidth_max_up" => 1000000
  "fullbandwidth_max_down" => 2000000
  "fullbandwidth_guaranty_up" => 300000
  "fullbandwidth_guaranty_down" => 400000
  "account_id" => 1000
  "location_id" => 3333
  "network_count" => 3
  "group_name" => "test_group"
  "vse_id" => 20
  "firewall_enabled" => false
]

$sample array info

array:23 [▼
  "cpe_mac" => "a0a1a2a3a4a5"
  "bandwidth_max_up" => 300000
  "bandwidth_max_down" => 500000
  "filter_icmp_inbound" => true
  "dmz_enabled" => false
  "dmz_host" => "http] = \/\/ddd.com"
  "vlan_id" => 2
  "dns" => array:2 [▶]
  "xdns_mode" => 0
  "cfprofileid" => 11111
  "stub_response" => ""
  "acl_mode" => 1
  "portal_url" => "http] = \/\/portal.com"
  "fullbandwidth_max_up" => 1000000
  "fullbandwidth_max_down" => 2000000
  "fullbandwidth_guaranty_up" => 300000
  "fullbandwidth_guaranty_down" => 400000
  "account_id" => 1234
  "location_id" => 3333
  "network_count" => 3
  "group_name" => "test_group"
  "vse_id" => 20
  "firewall_enabled" => false
]

I look through them countless time with my eyes, they look the same to me except their value. Then, I compare them programmatically,

$equal = ($cpe == $sample );
dd($equal); // false

I think, it return false because their values is different. Am I right ?

How do I check if those array have the same

If different, how can I find out what is it exactly that make them different?

Upvotes: 0

Views: 69

Answers (3)

Sherif
Sherif

Reputation: 11943

I'm not sure how you believe that these arrays can be equal. They're clearly not.

For example $sample["cpe_mac"] == "a0a1a2a3a4a5" and $cpe["cpe_mac"] == "298639133839". Also $sample["bandwidth_max_up"] == 300000 and $cpe["bandwidth_max_up"] == 30000. Just by looking at the array you can immediately tell they aren't equal so there's no logical reason to believe that $cpe == $sample should ever be true.

Also array_diff compares values as strings. What you have is a multi-dimensional array. So it is not possible to compute the differences of non-scalar elements in the array with array_diff.

Note:

This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]);.

Also a second note the manual elaborates...

Note:

Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same.

To compute the the non equal elements between the two arrays you may need to iterate over them and compare one element at a time.

Example

$diff = [];

foreach($cpe as $key => $value) {
    if (array_key_exists($key, $sample) && $sample[$key] !== $value) {
        $diff[$key] = $sample[$key];
    }
}

You could also write this as a recursive function to compute differences within n-dimensional arrays...

function array_diff_recursive(Array $a, Array $b, Array $diff = [])
{
    foreach($a as $k => $v) {
        if (!array_key_exists($k, $b)) {
            $diff[$k] = $v;
            continue;
        }
        if (is_array($v)) {
            $diff += array_diff_recursive($v, $b[$k], $diff);
        } else {
            if ($v !== $b[$k]) { // you could change this to == for loose comparison
                $diff[$k] = $v;
            }
        }
    }
    return $diff;
}

Upvotes: 1

Andrew
Andrew

Reputation: 2985

I would compare the array's key by this..

if (empty(array_diff_key($arr, $sample) ) ) {
    echo "they have the same key";
}

Although I should mention 55 is the same as "55", but this only apply an array's key that is an integer

Upvotes: 0

Basheer Kharoti
Basheer Kharoti

Reputation: 4302

array_diff require the first parameter An array to compare from and second parameter An array to compare against and will return an array containing the entries from Array to compare from that are not present in any of the other arrays

   $arr1 = array('first', 'second', 'third');
   $arr2 = array('first', 'second', 'third', 'fourth', 'fifth');
   print_r(array_diff($arr2, $arr1)); //Array ( [3] => fourth [4] => fifth )

but if you change the array places

 $arr1 = array('first', 'second', 'third');
 $arr2 = array('first', 'second', 'third', 'fourth', 'fifth');
 print_r(array_diff($arr1, $arr2)); //Array ( )

Upvotes: 0

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