PHP arrays: How to get the index where an element is

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!

php.net/manual/en/function.array-search.php and php.net/manual/de/function.array-keys.php — gearsdigital
– gearsdigital, Commented Sep 24, 2012 at 8:45

Mihai Matei · Accepted Answer · 2012-09-24 08:55:10Z

3

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));

edited Sep 24, 2012 at 8:55

answered Sep 24, 2012 at 8:48

Mihai Matei

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1 Comment

Mihai Matei Over a year ago

I forgot to return false if there is no match. I've edited the function

Olivier Kaisin · Accepted Answer · 2012-09-24 08:48:20Z

1

You should look using these :

in_array()
array_search()

answered Sep 24, 2012 at 8:48

Olivier Kaisin

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1 Comment

Neil Over a year ago

I think you could improve this answer by including links to these functions in the php documentation.

Hkachhia · Accepted Answer · 2012-09-24 08:47:46Z

0

You have used array_search function

$qkey=array_search(value,array);

answered Sep 24, 2012 at 8:47

Hkachhia

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1 Comment

Miguel Mas Over a year ago

returns false, and the element is there

Asciiom · Accepted Answer · 2012-09-24 08:47:53Z

0

You use array_search:

$index = array_search($chosenNumber, $myArray);
if($index){
    $element = $myArray[$index];
}else{
    // element not found
}

array_search returns false if the element was not found, the index of the element you were looking for otherwise.

If a value is in the array multiple times, it only returns the key of the first match. If you need all matches you need to use array_keys with the optional search_value parameter specified:

$indexes = array_keys($myArray, $chosenNumber);

This returns a (possibly empty) array of all indexes containing your search value.

answered Sep 24, 2012 at 8:47

Asciiom

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Comments

Afshin · Accepted Answer · 2012-09-24 09:11:02Z

0

array_keys()

Return all the keys or a subset of the keys of an array

array_values()

Return all the values of an array

array_key_exists()

Checks if the given key or index exists in the array

in_array()

Checks if a value exists in an array

You can find more information here http://www.php.net/manual/en/function.array-search.php

answered Sep 24, 2012 at 9:11

Afshin

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