show only values in my second array php

Question

I have two arrays which I am comparing. The comparison is working perfectly as follows:

  $tmp = array_diff_key($arr1, $arr2);
  $echo $tmp;

However, I only want to display the values that exist in array 2 that don't exist in array 1.

Edit: Ok so thank for everyone's help. How ever I am still unable to make it work.

I am now using

   $tmp = array_diff($arr2, $arr1);
  var_dump($tmp);

which prints out the following:

  array(1) { [0]=> array(3) { [0]=> string(4) "cars" [1]=> string(4) "vans" [2]=> string(6) "people" } }

So, I'll explain a little.

Array 1 has cars, vans (this is pulled from the database).

Array 2 has cars, people (this is entered from a form).

I'm trying to only show values that are not in the database so I thought $tmp would echo just people as cars is in the database and vans is in $arr1

I hope thats clear as its even confusing me writing it ;)

If I var_dump both array individually I get

    array(3) { [0]=> NULL [1]=> string(4) "cars" [2]=> string(4) "vans" } array(1) { [0]=> array(2) { [0]=> string(6) "people" [1]=> string(5) "tanks" } }

$echo should be echo and this won't print the contents of arrays anyway. — leftclickben
– leftclickben, Commented Feb 5, 2013 at 16:22

Explosion Pills · Accepted Answer · 2013-02-05 16:20:11Z

2

$tmp = array_diff_key($arr2, $arr1);
$echo $tmp;

echo $tmp will just output 'Array' I think, so you probably have to loop over it (perhaps with foreach) to display each individual value, or use var_dump.

array_diff_key also works with keys, array_diff with values (you mention "values" in your question).

answered Feb 5, 2013 at 16:20

Explosion Pills

192k56 gold badges341 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Daniel Robinson Over a year ago

Ok after clearing my cache it would appear this answer works great. thank you much :)

Achrome · Accepted Answer · 2013-02-05 17:01:05Z

2

Use array_intersect. array_intersect gives values which are in both.

$tmp2 = array_intersect($arr1, $arr2);
var_dump($tmp2);

Edit : Misread the question. array_diff will serve the purpose. array_diff returns values from argument1 which are not present in the rest of the arguments.

$tmp2 = array_diff($arr2, $arr1);
var_dump($tmp2);

Edit : In your case, your $arr2 has an array inside it which has the values. So, you will need to array_diff($arr2[0], $arr1);

Here's a working fiddle.

edited Feb 5, 2013 at 17:01

answered Feb 5, 2013 at 16:20

Achrome

7,82114 gold badges38 silver badges45 bronze badges

3 Comments

Daniel Robinson Over a year ago

I have changed now to array_diff but its still not working. My main question has been updated with your code and the output of a var_dump

Achrome Over a year ago

Can you please also add the var_dump of the individual arrays to the question?

Daniel Robinson Over a year ago

Done that array1 and array2 next to each other. This time in array 2 I entered tanks, people

Philippe Boissonneault · Accepted Answer · 2013-02-05 16:20:19Z

1

you can do as follows :

foreach($tmp as $key=>$value) {
    if(isset($arr2[$key])) {
        echo $arr2[$key];
    }
}

answered Feb 5, 2013 at 16:20

Philippe Boissonneault

3,9493 gold badges28 silver badges33 bronze badges

Comments

MikeB · Accepted Answer · 2013-02-05 16:20:49Z

1

From my understanding of array_diff_key, the function returns an array containing all the entries from argument1 whose keys are not present in any of the other arrays. So just put $arr2 into the first argument.

So your code should be:

$tmp = array_diff_key($arr2, $arr1);
$echo $tmp;

Source

answered Feb 5, 2013 at 16:20

MikeB

2,4721 gold badge16 silver badges24 bronze badges

1 Comment

Daniel Robinson Over a year ago

thanks @MikeB I have tried array_diff_key that way round and it just presents me with array(0) { } event though I know it should say people as cars is in array 1

CEPA · Accepted Answer · 2013-02-05 16:21:22Z

1

swap the direction:

$tmp = array_diff_key($arr2, $arr1);
  $echo $tmp;

answered Feb 5, 2013 at 16:21

CEPA

2,62227 silver badges31 bronze badges

Comments

Mike Brant · Accepted Answer · 2013-02-05 16:21:59Z

1

If you are concerned with values and not key values, then you should just use array_diff(). You would also need to reverse the order of the arrays in the parameters. Finally echoing an array isn't going to show you what you want, use var_dump(). So putting it all together:

$tmp = array_diff($arr2, $arr1);
var_dump($tmp);

answered Feb 5, 2013 at 16:21

Mike Brant

71.4k10 gold badges102 silver badges104 bronze badges

1 Comment

Daniel Robinson Over a year ago

thanks for your help but that just prints array(0) { } I have now updated my question

Collectives™ on Stack Overflow

show only values in my second array php

6 Answers 6

1 Comment

3 Comments

Comments

1 Comment

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

1 Comment

3 Comments

Comments

1 Comment

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related