Sets the class attribute for the tag.
| Value | Use |
|---|---|
| null | prevents the attribute from being added to the tag |
| string | adds the content of 'string' as the attribute value |
| array | adds each item in the array as an attribute value |
$class = 'class1 class2 class3';<tag class="class1 class2 class3" {...}$class = array('class1','class2','class3');<tag class="class1 class2 class3" {...}