I want to pass a variable with the block code like of JSON type in magento,
{{block type=\"multibanners/multibanners\" category_id=\"9\" name=\"multibanners\
I'm not 100% sure what you are asking, but if you are trying to pass a variable to multibanners.phtml
from the code above then you could create another attribute similar to category_id="9"
and in multibanners.phtml
you could get the value using $this->getData("category_id");
e.g.
{{block ... my_var="value here" ... template="multibanners/multibanners.phtml"}}
In multibanners.phtml
:
$this->getData('my_var');