Yii controls the width of the dropdownlist/select control and the width of the option_PHP tutorial

By default,
The width of the option will be determined by the widest element in options, and also determines the width of the select control

In Yii, if you need to customize the width of the select control, you can use htmlOptions to define it, as follows:


$currentSelectSource,
CHtml::listData($modelSource, 'domain_hash', 'site_name'),
array('empty'=>'-- all --','style'=>'width:200px;')
);?>

If you want to customize the width of the option, you have no choice but to write CSS to define it.