How to get the index number of an array?

Question

I have the following array:

Array
(
    [CPF_CNPJ] => Array
    (
    )
    [TIPO] => Array
    (
    )
    [NOME] => Array
    (
    )
)

I know that key(array) me returns the current key NAME in a loop, but would like to get the key index and not the name.

Example

[CPF_CNPJ] = 0
[TIPO] = 1
[NOME] = 2

I’ll have to make one foreach for that reason?

I did not see in the PHP manual a proper function for this.

Answer 1

For that, if I understand correctly, you can use array_keys():

$arr = array(
   'CPF_CNPJ' => array(),
   'TIPO' => array(),
   'Nome' => array(),
);

$arr = array_keys($arr);

Output from $arr:

Array
(
    [0] => CPF_CNPJ
    [1] => TIPO
    [2] => Nome
)

To know the key of a given value (original array key) of this new array:

array_search('TIPO', $arr); // 1

Summarizing, e.g.: to know the numerical index of the key 'Nome':

echo array_search("Nome", array_keys($arr)); // chave 2