src/Helpers/ArrayFunctionsHelperMethods.php
public function keys($search = null, bool $strict = true): array
    {
        return array_keys($this->getData(), $search, $strict);
    }
public function keys($search = null, bool $strict = true): array
    {
        return array_keys($this->getData(), $search, $strict);
    }
public function keys ( $ search = null , bool $ strict = true ) : array { return array_keys ( $ this -> getData ( ) , $ search , $ strict ) ; }
Returns all the keys in an array

@param mixed $search - OPTIONAL search parameter
@param bool $strict - OPTIONAL strict search comparison
@return array
Returns all the keys in an array