Question

I have an array like this:

Array
(
    [2] => Array
        (
            [0] => name2 surname
            [1] => [e-mail]
            [2] => 834502034
            [3] => image url3
        )

    [3] => Array
        (
            [0] => name3 surname
            [1] => [e-mail]
            [2] => 7648484886
            [3] => image url3
        )

    [0] => Array
        (
            [0] => name0 surname
            [1] => [e-mail]
            [2] => 56783658658
            [3] => image url0
        )

    [1] => Array
        (
            [0] => name1 surname
            [1] => [e-mail]
            [2] => 7648484886
            [3] => image url1
        )

)

youll notice that some of the values are the same and may only have a single difference in value.

I need to find out if another single array matches any on of the sub arrays and return the key.

the array I would match against is not multidimensional:

Array
            (
                [0] => name1 surname
                [1] => [e-mail]
                [2] => 7648484886
                [3] => image url1
            )

How do I find out if my single array is found within the main array and return the KEY?
Ive tried using array_diff_uassoc with a callback which returns the non matching key => array and I guess I could then match the count of both results to see if there is a difference, but I still need the key of the matched array. The array I am comparing against will always have the exact values [0],[1],[2] and [3].

Answer 1

array_search will do that, taking advantage of how comparing arrays for equality works in PHP (which means that the order of items inside each sub-array and in the array you provide as the search target must be the same!):

$master = array(
    array('surname', 'foo'),
    array('surname', 'bar'),
);

$key = array_search(array('surname', 'baz'), $master));

if ($key === false) {
    echo "not found";
}
else {
    echo "found, key is $key";
}