PHP : How to check value from multi arrays?

Question

I have an output arrays like this..

array
'B5' => string 'user1' (length=5)
'B4' => string 'user1' (length=5)

array
'D3' => string 'user1' (length=5)
'D2' => string 'user1' (length=5)
'D1' => string 'user1' (length=5)

array
'A4' => string 'user1' (length=5)
'A2' => string 'user1' (length=5)

array
 'E3' => string 'user1' (length=5)
 'E2' => string 'user1' (length=5)
 'E1' => string 'user1' (length=5)

I would like to check if a particular item such as 'E1' exists in these arrays. How should I go about this?

Community · Accepted Answer · 2017-05-23 12:12:57Z

1

Use array_key_exists() function.

Example:

$answer = array_key_exists('E1', $array_name);

Or, more simple:

$answer = isset($array_name['E1']);

Sidenote: discussion about the use of isset() vs array_key_exists(). Worth to read if you care the performance.

edited May 23, 2017 at 12:12

CommunityBot

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answered Feb 25, 2013 at 10:00

Raptor

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6 Comments

user1646111 Over a year ago

array_key_exists() can be used for one dimension array... only

Prasanth Bendra Over a year ago

This will not work for the array provided in the question, this will work only for one dimension array

Raptor Over a year ago

OP does not mention multi-dimensional arrays.

user1646111 Over a year ago

see title of the question~~~

Prasanth Bendra Over a year ago

Given array is a multi dimensional array

|

Prasanth Bendra · Accepted Answer · 2013-02-25 10:11:11Z

0

This will check array_key_exists recursively for multi demnsional aray

function array_key_exists_r($needle, $haystack)
{
    $result = array_key_exists($needle, $haystack);
    if ($result) return $result;
    foreach ($haystack as $v) {
        if (is_array($v)) {
            $result = array_key_exists_r($needle, $v);
        }
        if ($result) return $result;
    }
    return $result;
}

Ref: http://www.php.net/manual/en/function.array-key-exists.php#82890

edited Feb 25, 2013 at 10:11

answered Feb 25, 2013 at 10:03

Prasanth Bendra

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3 Comments

user1646111 Over a year ago

is that function crated by yourself? if not please mention the source!

user1646111 Over a year ago

No its from: stackoverflow.com/questions/2948948/…

Baba Over a year ago

I think they both took it from the same source .. looking at the date the php.net own is older ...

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