所以我在我当地的大学做我的学生工作，我们必须创建具有给定主题的整个网站。我选择了停车场主题，但我卡住了。卡住了，不知道在哪里寻找问题。我需要做的是从数据库中过滤给定的年份和月份数据，如下所示：
我的查询，从这个表中排序数据看起来像这样：
SELECT COUNT(parking_time) AS "Amont", SUM(sum) AS "Sum"
FROM parking_info
GROUP BY MONTH(parking_time), YEAR(parking_time).
以及此查询的输出：
如您所见，用户应该从 DROPDOWN 列表中选择年份和月份来选择特定月份来过滤来自 MySQL Query 的数据。例如：如果用户从下拉菜单中选择2013 年和10月，它应该只为用户输出特定的月份信息，即Amount 4 / Sum 170。但在我的情况下，它不输出任何内容（如您在我的网页）。
基本上我有functions.php文件，其中保存了所有计数、过滤器和SQL 查询。这个特定页面的我的functions.php文件如下所示：
<?php
function cleanFilterArray($filters) {
$new_filters = array();
if ($filters) {
foreach ($filters as $field => $data) {
if ($data != '%%') {
$new_filters[$field] = $data;
}
}
return $new_filters;
} else {
return false;
}
}
function get_months_in_LT()
{
$months = array();
$months[] = array(1, 'january');
$months[] = array(2, 'february');
$months[] = array(3, 'march');
$months[] = array(4, 'april');
$months[] = array(5, 'may');
$months[] = array(6, 'june');
$months[] = array(7, 'july');
$months[] = array(8, 'august');
$months[] = array(9, 'september');
$months[] = array(10, 'october');
$months[] = array(11, 'november');
$months[] = array(12, 'december');
return $months;
}
function get_month_in_LT($num)
{
$months = get_months_in_LT();
return $months[$num][1];
}
function get_month_report($filters) {
$where = null;
if ($filters) {
$filters = cleanFilterArray($filters);
foreach ($filters as $field => $data) {
if (!empty($data)) {
$where .= $field.' \''.$data.'\' AND ';
}
}
if ($where) {
$where = 'WHERE '.substr($where, 0, -5); //removes last 'AND' and adds a 'WHERE' to the begining
}
}
var_dump($where);
var_dump($filters);
$result = mysql_query('
SELECT COUNT(parking_time) AS "Amont", SUM(sum) AS "Sum"
FROM parking_info
GROUP BY MONTH(parking_time), YEAR(parking_time)
'.$where.'
');
$rows = array();
while ($row = mysql_fetch_row($result))
{
$rows[] = $row;
}
return $rows;
}
?>
我的实际页面包含所有 HTML 和所有其他内容，如下所示：
<?php
include_once 'functions.php';
if (isset($_GET['submit']))
{
$year = $_GET['year'];
$month = $_GET['month'];
}
else
{
$year = date('Y');
$month = date('m');
}
if (isset($_GET['submit']))
{
if (isset($year) && $year > (int) date('Y'))
{
$error = 'this years has not yet come!';
}
if (isset($month) && $month > (int) date('m'))
{
$error = 'this month has not yet come';
}
elseif (isset($year) && $year < 0)
{
$error = 'date cannot be negative';
}
elseif (isset($month) && ($month < 1 || $month > 12))
{
$error = 'not a month';
}
}
if (isset($_GET['submit']))
{
$year = $_GET['year'];
$month = $_GET['month'];
$filters = array(
"parking_time LIKE" => '%'.$year.'%',
"parking_time LIKE" => '%'.$month.'%'
);
}
include_once 'mysql.php';
if (isset($_GET['submit']) && !isset($error)){
$infos = get_month_report($filters);
}
$months = get_months_in_LT();
var_dump($infos);
?>
<?php include_once 'header.php' ?>
<h1>Month Report</h1>
<div id="main">
<p>How much per month was observed cars and what is the total amount of money collected</p>
<?php
if (isset($error))
{
echo "<p class=\"error\">Klaida: $error</p>";
}
?>
<form method="post">
<table border="1">
<tr>
<th>Year<span style="color:red">*</span></th>
<td><input type="text" name="year" value="<?php if (isset($year)) echo $year ?>" /></td>
</tr>
<tr>
<th>Month</th>
<td>
<select name="month" style="width:100%">
<?php
foreach ($months as $montha)
{
if (isset($month) && $month == $montha[0])
{
echo "<option value=\"$montha[0]\" selected=\"selected\">$montha[1]</option>";
}
else
{
echo "<option value=\"$montha[0]\">$montha[1]</option>";
}
}
?>
</select>
</td>
</tr>
<tr>
<td colspan="2" class="search"><button type="submit" name="submit" style="width:100%">Search</button></td>
</tr>
</table>
</form>
<br />
<br />
<?php if (isset($_GET['submit']) && sizeof($error) == 0): ?>
<table border="1">
<tr>
<th>Amount</th>
<th>Sum, LT</th>
</tr>
<?php
foreach ($infos as $info)
{
echo "<tr>";
echo "<td>$info[0]</td>";
echo "<td>$info[1]</td>";
echo "</tr>";
}
if (count($infos) == 0)
{
echo "<tr><td colspan=\"2\">Rezultatų nėra.</td></tr>";
}
?>
</table>
<?php endif; ?>
<br/>
<br/>
<br/>
<br/>
</div>
<?php include_once 'footer.php' ?>
希望有人能理解我的实际需要，因为我只是卡住了，不知道为什么这个页面没有输出任何东西。谢谢你。