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Question

我有这样的表格：

 <form method='post' name='form_filter' >
                                Filter By:
                                <select name ="select_name">
                                    <option>...</option>
                                    <option value = "plowest">Price Lowest</option>
                                    <option value = "phighest">Price Highest</option>
                                    <option value ="endingsoon">Ending Soon</option>
                                    <option value = "newlylisted">Newly Listed</option>
                                </select>
                                <input type='submit' value = 'Filter'>
                        </form>

然后在php中我这样做。例如，如果用户选择价格最低，我运行某个查询。如果他选择Price Highest，我选择另一个查询，依此类推。 我的PHP代码：

 if(isset($_POST['value'])) {
                        echo "HELLO";
                        if($_POST['value'] == 'plowest'){
                            echo($_POST['value']);
                             $query = "select *from(Select ROW_NUMBER() OVER(ORDER BY NAME ASC) as rn, $computerUserName.items.* FROM $computerUserName.items) where rn between $offset and $variable";
                        }
                    }
                    else{
                    $query = "select * from(Select ROW_NUMBER() OVER() as rn, $computerUserName.items.* FROM $computerUserName.items) where rn between $offset and $variable";
                    }                        
                    $stmt = db2_prepare($connection, $query);
                    $result = db2_execute($stmt);

但出于某种原因，如果我选择最低价格（价值最低），它仍会查询其他。

Answer 1

应该是：

if(isset($_POST['select_name'])) {
    echo($_POST['select_name']);
    if($_POST['select_name'] == 'plowest'){
        $query = "select *from(Select ROW_NUMBER() OVER(ORDER BY NAME ASC) as rn, $computerUserName.items.* FROM $computerUserName.items) where rn between $offset and $variable";
    }
    else{
        $query = "select * from(Select ROW_NUMBER() OVER() as rn, $computerUserName.items.* FROM $computerUserName.items) where rn between $offset and $variable";
    }                        
    $stmt = db2_prepare($connection, $query);
    $result = db2_execute($stmt);
}