PHP array_key_exists not working

Question

I have a PHP array that looks like this if I print_r($myarray)

Array ( [0] => Array ( [description] => testdecr [link] => testlink [image_id] => 150 ) )

I am trying to check for a key called image_id by doing this...

if (array_key_exists("image_id",$myarray)) {
        echo 'Image_id exists';
    }

This is not working, anyone any ideas what I am doing wrong?

Possible duplicate of [array\_key\_exists is not working](https://stackoverflow.com/questions/2948948/array-key-exists-is-not-working) — , Jun 29 '17 at 21:41

RomanPerekhrest · Accepted Answer · 2017-06-29T21:38:21.207

3

"image_id" key is on nested array under position 0.
It should be:

...
if (array_key_exists("image_id", $myarray[0]))

edited Jun 29 '17 at 21:38

answered Jun 29 '17 at 21:36

RomanPerekhrest

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Thank you, makes sense now. Could it be modified so that it wouldn't matter how many levels there are? – fightstarr20 Jun 29 '17 at 21:38
@fightstarr20, welcome. Yes, it can be modified to check if `image_id` key exists on any array level, but it sounds like new input condition – RomanPerekhrest Jun 29 '17 at 21:41

score 0 · Answer 2 · answered Jun 17 '23 at 07:51

You can use this function if you use a multi-dimensional array.

function array_key_exists_in_multi($key, $array)
        {
            $result = array_key_exists($key, $array);
            foreach ($array as $value) {
                $result = (is_array($value)) ? array_key_exists_in_multi($key, $value) : $result;
                if ($result) return $result;
            }
            return $result;
        }

This simple few lines function returns true if it finds any key from the array.

Example of the function:

if we pass this array as a parameter in the function, we can get the expected result.

$arr = array(
            '1' => 100,
            '2' => array(
                '16' => 200,
                '18' => array(
                    'example' => 100,
                    '101' => 101
                ),
            ),
            '3' => 400
        );

print array_key_exists_in_multi('example', $arr); //Output is: 1
print array_key_exists_in_multi('16', $arr); //Output is: 1
print array_key_exists_in_multi('2', $arr); //Output is: 1
print array_key_exists_in_multi('20', $arr); //Output is: 0

PHP array_key_exists not working

2 Answers2