Get the key from an array using php

Question

I have an array with the following format

Array
(
    [messages] => Array
        (
            [42321316] => 44556232
        )

    [text] => test message
    [count] => 1
)

I am trying to get the number '42321316' using following code

foreach($results as $k=>$y)
{
    echo $results[$k];
}

But it prints the values instead of getting the key of second array element.

foreach(array_keys($results) as $key){ echo $key."\n"; }

Kishore
– Kishore

2014-02-13 19:20:40 +00:00
Commented Feb 13, 2014 at 19:20 — Kishore
– Kishore, Commented Feb 13, 2014 at 19:20
There is a nested array.

Prithviraj Mitra
– Prithviraj Mitra

2014-02-13 19:22:10 +00:00
Commented Feb 13, 2014 at 19:22 — Prithviraj Mitra
– Prithviraj Mitra, Commented Feb 13, 2014 at 19:22

Amal · Accepted Answer · 2014-02-13 19:35:59Z

1

Use array_search() to achieve this:

$key = array_search('44556232', $results['messages']);
echo $key; // => 42321316

The above code is useful only if you know the array index beforehand. If the search key is dynamic, then you need a dynamic solution as well:

$keyToSearchFor = '44556232';

foreach ($results as $key => $value) {
    if (is_array($value)) {
        echo array_search($keyToSearchFor, $value);
        break;
    }
}

Demo.

answered Feb 13, 2014 at 19:35

Amal

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JamesHalsall · Accepted Answer · 2014-02-13 19:18:38Z

0

foreach ($results as $key => $value) {
    $subKey = array_search(44556232, $value);
    if (false !== $subkey) {
        echo $key;
    }
}

answered Feb 13, 2014 at 19:18

JamesHalsall

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Comments

Amal · Accepted Answer · 2014-02-13 19:39:03Z

0

You should do echo $results ['messages'][42321316]; instead.

edited Feb 13, 2014 at 19:39

Amal

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answered Feb 13, 2014 at 19:19

makallio85

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1 Comment

showdev Over a year ago

OP wants the key, not the value.

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