！ php 怎么提交多个多项列表

紧急求助！ php 如何提交多个多项列表
小白发帖求助。。。如截图所示，目前网页上有4个单选列表和多个多选列表，目的是用户点击Submit 按钮，后台获取已选择的选项，然后再在数据库中搜索，最后返回相应的搜索结果。 

可是现在我都不知道如何在点击Submit后，获取user的选择的选项。 就是说关于Submit 的PHP 代码该怎么写啊啊。中间貌似还要涉及到转义字符的问题，求大家帮助！

附：代码片段和网页截图 (表单里的内容都是一些机械的feature，希望用户可以通过选择feature，搜索到所需的机械型号)

1) 这是一个单选列表

HTML code

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<div id="fourth" class="selection_options">
<select name="case_mounting" size="1" title="case and mounting">
  <option value=' 1" SQR. PANEL'> 1" SQR. PANEL</option>
  <option value='0.95"X1.75" PANEL'>0.95"X1.75" PANEL</option>
  <option value='2"X3" FLAT PACK PANEL'>2"X3" FLAT PACK PANEL</option>
  <option value="HAND HELD CALIBRATOR">HAND HELD CALIBRATOR</option>
  <option value="EXP. PROOF CONDUIT">EXP. PROOF CONDUIT</option>
  <option value='1.45"X2.55" PANEL'>1.45"X2.55" PANEL</option>
  <option value='NEMA 4X2.6"X3.7" CONDUIT/WALL'>NEMA 4X2.6"X3.7" CONDUIT/WALL</option>
  <option value='1.6"X2" PANEL'>1.6"X2" PANEL</option>
  <option value='AVIATION 1" DIAMETER'>AVIATION 1" DIAMETER</option>
  <option value="DINRAIL">DINRAIL</option>
  <option value='3 1/2" BARREL PANEL'>3 1/2" BARREL PANEL</option>
  <option value="1/8 DIN PANEL">1/8 DIN PANEL</option>
  <option value="1/4 DIN PANEL">1/4 DIN PANEL</option>
  <option value='4" SWITCHBOARD PANEL'>4" SWITCHBOARD PANEL</option>
  <option value='1.5"X2.9"X2" PANEL'>1.5"X2.9"X2" PANEL</option>
  <option value='6"X1" EDGEWISE PANEL'>6"X1" EDGEWISE PANEL</option>
  <option value='6"X1.75" EDGEWISE PANEL'>6"X1.75" EDGEWISE PANEL</option>
  <option value='6.6"X1.4" EDGEWISE PANEL'>6.6"X1.4" EDGEWISE PANEL</option>
  <option value='11.3"X1.4" EDGEWISE PANEL'>11.3"X1.4" EDGEWISE PANEL</option>
  <option value='7"X1.4" EDGEWISE PANEL'>7"X1.4" EDGEWISE PANEL</option>
  <option value='7.3"X2.8" EDGEWISE PANEL'>7.3"X2.8" EDGEWISE PANEL</option>
  <option value='6.3"X2.8 EDGE PANEL '>6.3"X2.8 EDGE PANEL </option>
  <option value='5.7"X1.9" EDGE PANEL'>5.7"X1.9" EDGE PANEL</option>
  <option value='5.7"X2.84" EDGE PANEL'>5.7"X2.84" EDGE PANEL</option>
  <option value="NAKED PANEL/PCB MOUNT">NAKED PANEL/PCB MOUNT</option>
  <option value='6"X3.1" EDGE PANEL'>6"X3.1" EDGE PANEL</option>
  <option value='6"X6"X3" SANITARY'>6"X6"X3" SANITARY</option>
  <option value="VARIOUS SIZES & MOUNTING">VARIOUS SIZES & MOUNTING</option>
</select>
</div>

2) 这是其中一个复选列表

HTML code

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<div id="fifth" class="selection_name">
Outputs (Use ctrl+click to make multiple choices)
</div>
<div id="fifth" class="selection_options">
<select name="outputs[]" size="6" multiple title="out puts">
  <option value="NULL" selected> </option>
  <option value="ANALOG 4-20mA/VDC">ANALOG 4-20mA/VDC</option>
  <option value="RELAYS">RELAYS</option>
  <option value="OPEN COLL. XTR">OPEN COLL. XTR</option>
  <option value="IRDA">IRDA</option>
  <option value="4-20mA CALIBRATOR">4-20mA CALIBRATOR</option>
  <option value="WIRELESS ON REQUEST">WIRELESS ON REQUEST</option> 
</select>

 <div class="clear">
                 
              
              
        
            </div>
</div>