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Add a form variable check to servicetype

From Cyclone3 Wiki

For security reasons, you might want to check user-posted form data for correctness before using them in modules, this allows you a better control of SQL injection or incorrect data control on your page.

The statement for variable check looks like this

<CHECK_FORM variable="ID" type="int" action="destroy" />

Escape variable to use in SQL (is better to bind variables in SQL execute)

<CHECK_FORM variable="ID" action="sql_escape" />