PHP数组：如何获取元素所在的索引

Question

Here’s the following array:

Array
(
    [1] => Array
        (
            [0] => 10
            [1] => 13
        )

    [2] => Array
        (
            [0] => 8
            [1] => 22
        )

    [3] => Array
        (
            [0] => 17
            [1] => 14
        )
)

Then I have

$chosenNumber = 17

What I need to know is:

First) if 17 is in the array

Second) the key it has (in this case [0])

Third) the index it belongs (in this case [3])

I was going to use the in_array function to solve first step but it seems it only works for strings ..

Thanks a ton!

Answer 1

function arraySearch($array, $searchFor) {
    foreach($array as $key => $value) {
        foreach($value as $key1 => $value1) {
            if($value1 == $searchFor) {
                return array("index" => $key, "key" => $key1);
            }
        }
    }

    return false;
}

print_r(arraySearch($your_array, 17));