thinkphp关联查询 condition条件中包含变量出错

'wz_lb'=>array(
'mapping_type' => self::HAS_MANY,
'class_name' => 'wz_lb',
'foreign_key' => 'lbid',
'mapping_name' => 'wz_lb',
'condition' =>'yhid='.$yhid
),
按照上面这样写的话出现，

请教各位大神怎么解决condition条件中包含变量。