Html::attr()

Html::attr(string|array $name, mixed $value = null): string|null

Parameters

Name	Type	Default	Description
$name *	`string`\|`array`	–	String: A single attribute with that name will be generated. Key-value array: A list of attributes will be generated. Don't pass a second argument in that case.
$value	`mixed`	`null`	If used with a `$name` string, pass the value of the attribute here. If used with a `$name` array, this can be set to `false` to disable attribute sorting.

string|null