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?

score 1 · Accepted Answer · edited May 23 '17 at 12:12

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 '17 at 12:12

Community

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answered Feb 25 '13 at 10:00

Raptor

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array_key_exists() can be used for one dimension array... only – Feb 25 '13 at 10:02
This will not work for the array provided in the question, this will work only for one dimension array – Prasanth Bendra Feb 25 '13 at 10:04
OP does not mention multi-dimensional arrays. – Raptor Feb 25 '13 at 10:05
see title of the question~~~ – Feb 25 '13 at 10:06
Given array is a multi dimensional array – Prasanth Bendra Feb 25 '13 at 10:06
multi-array != multi-dimensional array & i think the output is 4 arrays. Let's see how OP responses. – Raptor Feb 25 '13 at 10:08

Prasanth Bendra · Answer 2 · 2013-02-25T10:11:11.563

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 '13 at 10:11

answered Feb 25 '13 at 10:03

Prasanth Bendra

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is that function crated by yourself? if not please mention the source! – Feb 25 '13 at 10:05
No its from: http://stackoverflow.com/questions/2948948/array-key-exists-is-not-working – Feb 25 '13 at 10:15
I think they both took it from the same source .. looking at the date the php.net own is older ... – Baba Feb 25 '13 at 10:22

PHP : How to check value from multi arrays?

2 Answers2