yii\helpers\BaseArrayHelper::isTraversable PHP Method

This method does the same as the PHP function is_array() but additionally works on objects that implement the [[\Traversable]] interface.

See also: http://php.net/manual/en/function.is_array.php

Since: 2.0.8

public static isTraversable ( mixed $var ) : boolean
$var	mixed	The variable being evaluated.
return	boolean	whether $var is array-like

    public static function isTraversable($var)
    {
        return is_array($var) || $var instanceof \Traversable;
    }

BaseArrayHelper