一维数组新建及取值
$column_dirt = [];
$column_dirt[0]=0;
$column_dirt['name']=name //类似字典
取值
echo $column_dir['name']
HTML中下拉框默认选中 属性 selected
<html>
<body>
<select>
<option>AAA</option>
<option >BBB</option>
<option selected>CCC </option>
</select>
</body>
</html>