CODEWITHSUNDEEP
phparraysjsoncompare
Martin O
Martin O

Reputation: 51

Comparing 2 json strings to find new entries

I am trying to compare 2 json strings with each other to find all new entries in the list.

This is how I am comparing them:

$json = json_decode(file_get_contents("new.json"), true);
$last_json = json_decode(file_get_contents("last.json"), true);
$difference = array_diff($json, $last_json);

print_r($difference);

I am expecting it to return an array with all new entries. However, I am just getting an empty array in return.

Any help would be appreciated!

Additional information: I am also trying to compare the values of the arrays. This is how I'm trying to do that:

foreach($json["whitelist_name"] AS $json_key => $json_val) {
        foreach($last_json["whitelist_name"] AS $last_json_key => $last_json_val) {
            if($json["whitelist_name"] != $last_json["whitelist_name"]) {
                echo $json["whitelist_name"];
            }
        }
    }

However, it seems that $json["whitelist_name"] is undefined

Upvotes: 4

Views: 5800

Answers (1)

Atif
Atif

Reputation: 280

array_diff_assoc is the way to get difference of associative arrays:

$json = json_decode(file_get_contents("new.json"), true);
$last_json = json_decode(file_get_contents("last.json"), true);
$difference = array_diff_assoc($json, $last_json);

print_r($difference);

This small piece of code will find out if any whitelist_name is different in the new json than the old one 

foreach($last_json as $key=>$value){
    if($value['whitelist_name'] != $json[$key]['whitelist_name']){
        // value is changed
    }else{
        // value is not changed
    }
}

Upvotes: 6

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