如何从数组中获取键值？

Question

Here is the array:

$campaigns = 
Array (
[252] =>Array ( 
        [campaign_type_id] => 9 
        [company] => Array ( 
                    [company_name] => facebook 
                    [company_type] => 2 
                   )
        [campaign] => Array(
                    [pitch_id] => 27 
                    [pitch_campaign_title] => facebook mandate 
                        [pitch_campaign_description] => desc face 
                    [pitch_campaign_image] => db.png 
                   )
        [title] => Accelarator 
        [selection] => Array ( 
                    [0] => Array(
                             [ca_mandate_id] => 96 
                            [ca_id] => 252 
                            [ca_company_id] => 1 
                            [ca_updated] => 2015-12-31 12:37:50
                            )
                    ) 
        [campaign_created_by] => 3 
        [userinfo] => Array ( 
                    [0] => Array ( 
                            [user_id] => 3 
                            [user_first_name] => CoLabs 
                            [user_last_name] => Accelerator 
                            [user_img] => index2.jpg 
                            [user_designation_name] => Investor
                             [user_company_id] => 123
                              )
                     )
         )
   )

how can I get the value '252'? Its a dynamic value. I want to get whatever value is stored in place of 252.

Please help?

Thanks in advance.

Answer 1

Use the array_keys function: http://php.net/array_keys

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

Description array array_keys ( array $array [, mixed $search_value = null [, bool $strict = false ]] )

For your code:

$keys = array_keys($campaigns);

Answer 2

Try array_keys

array_keys() returns the keys, numeric and string, from the array.

$req_key = array_keys($campaigns);

Answer 3

You can use array_keys() (as other suggested) and key() functions for getting this result.

Difference is that:

If you want to use array_keys() function it will returns you an array that consist of all keys .

If you want to use key() function it will returns you the first index of array . (you can get all keys by using loop);

Example 1 (With array_keys):

$arry = array(1,2,3);
echo "<pre>";
print_r(array_keys($arry));

Result:

Array
(
    [0] => 0
    [1] => 1
    [2] => 2
)

Example 2 (With key):

$arry = array(1,2,3);
echo key($arry);

Result:

0 // index