get_instance()

password_verify($password, $hash)

mb_substr($str, $start[, $length = NULL[, $encoding = NULL]])

function_usable($function_name)

array_column(array $array, $column_key[, $index_key = NULL])

html_escape($var)

config_item($key)

array_replace_recursive(array $array1[, ...])

array_replace(array $array1[, ...])

is_really_writable($file)