Difference Between Two Multidimentional Array on base of values

Question

I have Two Arrays

Array
(
    [0] => Array
        (
            [option_value_id] => 82
            [product_option_value_id] => 18771
            [quantity] => 25
        )

    [1] => Array
        (
            [option_value_id] => 46
            [product_option_value_id] => 18776
            [quantity] => 5
        )


)

2nd Array

Array
(
    [0] => Array
        (
            [option_value_id] => 82
            [product_option_value_id] => 18771
            [name] => Apricot
            [quantity] => 30
        )

    [1] => Array
        (
            [option_value_id] => 51
            [product_option_value_id] => 18780
            [name] => 2XL
            [quantity] => 5
        )

    [2] => Array
        (
            [option_value_id] => 48
            [product_option_value_id] => 18778
            [name] => L
            [quantity] => 5
        )

    [3] => Array
        (
            [option_value_id] => 46
            [product_option_value_id] => 18776
            [quantity] => 5
        )

)

Now i want What is the Difference between Two Arrays Regardless of its sorting . if their is a difference between two arrays show me true or false The Result should be

Array
(
    [0] => Array
        (
            [option_value_id] => 82
            [product_option_value_id] => 18771
            [name] => Apricot
            [quantity] => 30
        )

    [1] => Array
        (
            [option_value_id] => 51
            [product_option_value_id] => 18780
            [name] => 2XL
            [quantity] => 5
        )

    [2] => Array
        (
            [option_value_id] => 48
            [product_option_value_id] => 18778
            [name] => L
            [quantity] => 5
        )

)

Because in first index quantity is change from 25 to 30 and the other indexes are not pressent in the first array,

http://stackoverflow.com/questions/12246039/multidimensional-array-difference-php — user3664519, Feb 23 '17 at 11:30
Possible duplicate of [multidimensional array difference php](http://stackoverflow.com/questions/12246039/multidimensional-array-difference-php) — B. Desai, Feb 23 '17 at 11:32
Causing undue bloat on SO by one user asking the same question twice -- poor form. Asking us to chase your code around SO so we can solve your issue is also poor form. — mickmackusa, Feb 23 '17 at 11:34

score 1 · Answer 1 · answered Feb 23 '17 at 14:23

I'm going to make some assumptions here. If they are wrong please edit your question to clarify...

Your second array will never be smaller than your first array.
All sub-arrays in your first array will exist in your second array.

option_value_id values are unique within each array.

<?php
/* setup arrays */
$a=array(
    array("option_value_id"=>82,
          "product_option_value_id"=>18771,
          "quantity"=>25),
    array("option_value_id"=>46,
          "product_option_value_id"=>18776,
          "quantity"=>5)
);
$b=array(
    array("option_value_id"=>82,
          "product_option_value_id"=>18771,
          "name"=>"Apricot",
          "quantity"=>30),
    array("option_value_id"=>51,
          "product_option_value_id"=>18780,
          "name"=>"2XL",
          "quantity"=>5),
    array("option_value_id"=>48,
          "product_option_value_id"=>18778,
          "name"=>"L",
          "quantity"=>5),
    array("option_value_id"=>46,
          "product_option_value_id"=>18776,
          "quantity"=>5)
);
/* Use `option_value_id` as new key for each sub-array in $a & $b */
/* If you can do this earlier in your code, you can omit this step */
foreach($a as $i=>$arr){
    $new_a[$arr["option_value_id"]]=$arr;
}
foreach($b as $i=>$arr){
    $new_b[$arr["option_value_id"]]=$arr;
}
/* Loop through $b and check for duplicates. */
foreach($new_b as $b_key=>$b_sub){
    if(isset($new_a[$b_key]) && $b_sub===$new_a[$b_key]){   // exists in $a & dupe
        unset($new_b[$b_key]);
        echo "option_value_id: $b_key was identical and was dropped.<br>";
    }else{
        echo "option_value_id: $b_key is new or changed (unique)<br>";
    }
}
echo "<br>";
echo (sizeof($new_b)?"True, changes were made":"False, no changes");

Output:

option_value_id: 82 is new or changed (unique)
option_value_id: 51 is new or changed (unique)
option_value_id: 48 is new or changed (unique)
option_value_id: 46 was identical and was dropped.

True, changes were made

I deliberately avoided using array_unique() and array_diff() because there are claims they cannot be trusted to use === comparisons. As for the foreach loops, I have read many times that they outperform most php functions that do the same job. If you have speed concerns please benchmark and make an informed decision.

@user3664519 if this solution meets your satisfaction, please put a green tick on it so others can consider this question sufficiently answered. — mickmackusa, Feb 25 '17 at 12:07

score 0 · Answer 2 · answered Feb 23 '17 at 11:32

Use array_diff()function and it will solve your problem

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");

$result=array_diff($a1,$a2);
print_r($result);
?>

Output: Array ( [d] => yellow )

Difference Between Two Multidimentional Array on base of values

2 Answers2