Comparing php array key value

Question

I am trying to compare two array value. My array1 is like

$a1 = array('123' => 'test1', '456' => 'test2', '789' => 'test3');

array2 is like

$a2 = array('456' => 'match2', '99' => 'match3');

$a3 = array();

I want to compare the key value. If array1 key matches array2 key, push array1 element to a new array

I have

  for($i=0; $i < count($a1); $i++){
       //i am not sure how to write my codes heree......
        if($a1[$i]==a2[$i]{
            $a3[]=a1$[$i];
        }
    }

Can someone help me out on this? Thanks a lot!

Beginning to think I should start posting my answers in the comment section instead. — Rayhan Muktader
– Rayhan Muktader, Commented Sep 30, 2013 at 16:06

Rayhan Muktader · Accepted Answer · 2013-09-30 16:05:17Z

2

You can use array_intersect_key http://www.php.net/manual/en/function.array-intersect-key.php

Code:

$a1 = array('123' => 'test1', '456' => 'test2', '789' => 'test3');

$a2 = array('456' => 'match2', '99' => 'match3');

$a3 = array_values(array_diff_key($a1, $a2));

print_r($a3);

Output:

Array
(
    [0] => test1
    [1] => test3
)

This is what you are after right? It should be faster than a for loop since it's a native PHP function.

edited Sep 30, 2013 at 16:05

answered Sep 30, 2013 at 15:57

Rayhan Muktader

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1 Comment

SERPRO Over a year ago

try to elaborate a little bit more the answer, instead of just the link, write some code :)

Tank-n-Spank · Accepted Answer · 2013-09-30 15:56:50Z

0

This should work, though I haven't tested it

foreach ($a1 as $k1 => $v1) {
   if (isset($a2[$k1]))
      $a3[$k1] = $v1;
}

You loop through all the elments of $a1 and check if that key exists in $a2. If it does you add the element to $a3 (the code above adds it with the existing key, if you want to discard the keys, just use $a3[] = $v1;)

answered Sep 30, 2013 at 15:56

Tank-n-Spank

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Comments

aaron · Accepted Answer · 2013-09-30 16:05:36Z

0

$a1= array('123' => 'test1', '456' => 'test2', '789' => 'test3');
$a2=array('456' => 'match2', '99' => 'match3');
$ai = array_intersect_key($a1, $a2);
$a3 = array_values($ai);

answered Sep 30, 2013 at 16:05

aaron

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