[RESOLVED] Comparing two index arrays & find index if matched

[computerzworld]

Hello,
I am having two index arrays in which one contains 25 elements & another contains 92 elements. From these the small array's all values are in big array & I want to find these values are at which position. And want to push it in one another array. How can I do this? Please help me. Thanks in advance..

[nrg_alpha]

Simplified example:

$arr1 = array(1,12,22,44,56);
$arr2 = array(12,44);
$arrFinal = array_intersect($arr1, $arr2);
echo "<pre>".print_r($arrFinal, true);

Output:

Array
(
    [1] => 12
    [3] => 44
)

In this case, there are two values the smaller array set found in the larger one (the first is value 12 at element 1 in the large one, and the second value is 44 which is in element 3 in the large one. Obviously, those matches are stored into array $arrFinal.

[laserlight]

Depending on your exact requirements you can use either [man]array_search/man or [man]array_keys/man, e.g.,

$indices = array();
foreach ($small_array as $search_value) {
    if (($key = array_search($search_value, $big_array)) !== false) {
        $indices[] = $key;
    }
}

EDIT:
Ah. since array_intersect() preserves the keys, that would be a better choice. You can just use array_keys() to get the indices.

[computerzworld]

thats the ultimate solution.... thanks for that.....

[laserlight]

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