Question

我有6个<select>个方框。我正在根据<select>框创建报告。我所做的是创建一个表单并设置GET方法，然后通过下一页的$ _GET方法获取这些值。像

<form method="get" action="report.php">

<select name="select1">
<option value="none">Select value</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>


<select name="select2">
<option value="none">Select value</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>

<select name="select3">
<option value="none">Select value</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
.....................
</form>

这是PHP代码。（这些都是样本数据：P）只是想告诉别人我的问题。我正在检查所有值，如果它的值等于none，则执行此操作，等等。

if(
$cby == "none" 
&& $crequirment == "none" 
&& $cdepartment == "none" 
&& $period == "none" 
&& $ccontact == "none" 
&& $cattend == "none"
)
{
    $query = mysqli_query($db, "SELECT * FROM customer");
}



else if (
$cby != "none" 
&& $crequirment == "none" 
&& $cdepartment == "none" 
&& $period == "none" 
&& $ccontact == "none" 
&& $cattend == "none"
)
{
    $query = mysqli_query($db, "SELECT * FROM customer WHERE cby = $cby");
}
else if (
$cby == "none" 
&& $crequirment == "none" 
&& $cdepartment != "none" 
&& $period == "none" 
&& $ccontact == "none" 
&& $cattend == "none")
{
    $query = mysqli_query($db, "SELECT * FROM customer WHERE cdepartment = $cdepartment");
}
else if..........

我想要的是尽可能简单。我应该采用什么方法呢？

Answer 1

优化您的代码。

创建名称为data[cby]，data[crequirment]的选择。
而不是none使用空字符串。

在PHP中：

if (isset($_GET['data']) {
    $where = [];

    foreach ($_GET['data'] as $name => $value) {
        if ($value != '') {
            $where[] = $name."=".$value; // sanitize `$name` and `$value` first
        }
    }

    if (!empty($where)) {
        $whereString = ' WHERE '.implode(' AND ', $where);
    } else {
        $whereString = '';
    }

    $query = mysqli_query($db, "SELECT * FROM customer".$whereString);
}

如何在PHP中进行下拉基础MySQL查询

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