html - How to use index of loop in Post method PHP -

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i need help! trying save variable in sql table using php have problem. there 2 questions in php, first concern continent , second depended continent. want use loop check of continents has been selected in first question , save value of second question. hide option of unchecked continent using javascript code (i don't have problem).

the html code:

<form method="post" action="">   <fieldset><legend>continents</legend>             <select id="q1" name="q1">                 <option value="1">africa</option>                 <option value="2">asia</option>                  <option value="3">australia</option>                 <option value="4">america</option>                  <option value="5">europe</option>             </select>              <select id="q2" name="africa">                 <option value="1">choice 1</option>                 <option value="2">choice 2</option>              </select>              <select id="q2" name="asia">                 <option value="1">choice 1</option>                 <option value="2">choice 2</option>              </select>              <select id="q2" name="australia">                 <option value="1">choice 1</option>                 <option value="2">choice 2</option>              </select>              <select id="q2" name="america">                 <option value="1">choice 1</option>                 <option value="2">choice 2</option>              </select>              <select id="q2" name="europe">                 <option value="1">choice 1</option>                 <option value="2">choice 2</option>              </select> </fieldset>

the php code

$q1 = $_post['q1']; $continents = array("africa","asia", "australia","america","europe");  ($i = 1; $i <= 5; $i++) {  if($q1 == $i) {     $q2 = $_post[$continents[$i-1]] } }

your array should 1 5 instead of 0 4 have values 1 5 in q1.

alternatively, suggest change html structure continent value in single line without using loop. need change values of continent like,

<select id="q1" name="q1">     <option value="africa">africa</option>     <option value="asia">asia</option>      <option value="australia">australia</option>     <option value="america">america</option>      <option value="europe">europe</option> </select>

and value of selected continent use $_post[$_post['q1']]. egs, $_post['q1']=asia, $_post['asia'] return asia's choice,

$q2= $_post[$_post['q1']];

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