title: which PDO::PARAM_* to use with a SET() datatype?
body: <p>I have an array of values, and one of the values is another array (see below). I implode the inner-array so that it becomes v<sub>0</sub>,v<sub>1</sub>,v<sub>x</sub> and I'm inserting it into a column of a mysql database where the datatype is <code>SET()</code></p>
  
  <pre><code>a = array(
      "first"=&gt;"foo",
      "second"=&gt;array("b","a","r"), // this becomes "second"=&gt;"b,a,r",
      "third"=&gt;"bang"
  )
  </code></pre>
  
  <p>My question is which <code>PDO::PARAM_*</code> should I use?<br />
  <i>(Initially I would think <code>PARAM_STR</code>, but I'm not sure if PDO will do something that won't work with <code>SET()</code>).</i></p>