How to tell if array contains another array

Question

Well this has been a headache.

I have two arrays;

$array_1 = Array
(
    [0] => Array
        (
            [id] => 1
            [name] => 'john'
            [age] => 30
        )

[1] => Array
        (
            [id] => 2
            [name] => 'Amma'
            [age] => 28
        )

[2] => Array
        (
            [id] => 3
            [name] => 'Francis'
            [age] => 29
        )

)

And another array

array_2 = = Array
    (
        [0] => Array
            (
                [id] => 2
                [name] => 'Amma'
            )

    )

How can I tell that the id and name of $array_2 are the same as the id and name of $array_1[1] and return $array_1[1]['age']?

Thanks

This looks like some sql data, maybe a join would be a good option? — Drathier
– Drathier, Commented Jan 28, 2014 at 18:28

131 · Accepted Answer · 2014-01-28 18:39:08Z

3

foreach($array_1 as $id=>$arr)
{
    if($arr["id"]==$array_2[0]["id"] AND $arr["name"]==$array_2[0]["name"])
    {
        //Do your stuff here
    }
}

edited Jan 28, 2014 at 18:39

answered Jan 28, 2014 at 18:26

131

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3 Comments

Ilan Kleiman Over a year ago

Never thought of that before, Thats a-lot simpler. That'll help me, thanks!

Alireza Fallah Over a year ago

dont you think its exactly the same as my answer ? ;)

lomse Over a year ago

You are awesome. Sorry for the delay as I was in a traffic ;)

Gregory Magarshak · Accepted Answer · 2014-02-10 15:23:29Z

3

Well you can do it in a straightforward loop. I am going to write a function that takes the FIRST element in $array_2 that matches something in $array_1 and returns the 'age':

function getField($array_1, $array_2, $field)
{
   foreach ($array_2 as $a2) {
      foreach ($array_1 as $a1) {
         $match = true;
         foreach ($a2 as $k => $v) {
            if (!isset($a1[$k]) || $a1[$k] != $a2[$k]) {
              $match = false;
              break;
            }
         }
         if ($match) {
            return $a1[$field];
         }
      }
   }
   return null;
}

edited Feb 10, 2014 at 15:23

answered Jan 28, 2014 at 18:36

Gregory Magarshak

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2 Comments

loveNoHate Over a year ago

Bad idea to use or, it has a lower precedence than !=. php.net/manual/en/language.operators.precedence.php. Means you have to use ||. Or wait, do you mean it? ;)

loveNoHate Over a year ago

Hey, I just wonder, did you actually read that?!? Haha, I made a mistake, || or or both have a lower precedence than !=.

Community · Accepted Answer · 2023-11-17 20:42:18Z

2

Use array_diff().

In my opinion, using array_diff() is a more generic solution than simply comparing the specific keys.

Array_diff() returns a new array that represents all entries that exists in the first array and DO NOT exist in the second array.

Since your first array contains 3 keys and the seconds array contains 2 keys, when there's 2 matches, array_diff() will return an array containing the extra key (age).

foreach ($array_1 as $arr) {
   if (count(array_diff($arr, $array_2[1])) === 1) {//meaning 2 out of 3 were a match
      echo $arr['age'];//prints the age
    }
}

Hope this helps!

edited Nov 17, 2023 at 20:42

CommunityBot

11 silver badge

answered Jan 28, 2014 at 18:30

dev7

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Comments

Alireza Fallah · Accepted Answer · 2014-01-28 18:37:24Z

1

I assume you want to find the age of somebody that has a known id and name.

This will work :

foreach ($array_1 as $val){
    if($val['id']==$array_2[0]['id'] && $val['name']==$array_1[0]['name']){
        $age = $val['age'];
    }
}
echo $age;

edited Jan 28, 2014 at 18:37

answered Jan 28, 2014 at 18:27

Alireza Fallah

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2 Comments

131 Over a year ago

I wonder too. i didn't downvote. But your answer was correct.

131 Over a year ago

If you don't trust me, i can downvote you, to show that your answer will be downvoted with "-1", (Only for testing of course) and then upvote again. Stackoverflow, should really consider showing who downvotes..

Community · Accepted Answer · 2017-05-23 12:21:00Z

0

Try looking into this.

http://www.w3schools.com/php/func_array_diff.asp

And

comparing two arrays in php

-Best

edited May 23, 2017 at 12:21

CommunityBot

11 silver badge

answered Jan 28, 2014 at 18:33

arpan shah

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