表格陣列重疊

Question

我做了一個聯繫表格，但即時嘗試一個Dropbox，所以你可以選擇多個選項，但是當我使用數組來選擇多個重疊其他Dropbox和去所有奇怪這裏是與PHP數組。 prntscr點com/8d2c5

<select name="skills[ ]" multiple> 
    <option value="Permaculture">Permaculture</option> 
    <option value="Recycling">Recycling</option> 
    <option value="Sewing">Sewing</option> 
</select> 

/select> 
<label for="select" class="select"> 
<select name="participate[]" id="participate" multiple> 
    <option value="" selected>When can you participate?</option> 
    <option value="3-6 months from now">3-6 months from now</option> 
    <option class="purple" value="6-12 months">6-12 months</option> 
    <option value="Next Year (2016)">Next Year (2016)</option> 
    <option class="purple" value="Community Crowd Funding">Community Crowd Funding</option> 
</select> 

在PHP中，我把

$skills = implode(",", $_POST['skills']);