Php 如何添加带有表头的图像？

如何使用表格标题在不同时间显示三个图像。我有一个表头的代码，以及以升序和降序显示数据的链接，并对它们进行过滤

echo "<table  width='100%'>

   <tr>
     <th><a href= 'http://192.168.0.49/intern/index.php?page=".$_GET["page"]."&date1=".$_GET["date1"]."&date2=".$_GET["date2"].         "&orderby=id&dir=".$dir."'>Id</th>
     <th><a href= 'http://192.168.0.49/intern/index.php?page=".$_GET["page"]."&date1=".$_GET["date1"]."&date2=".$_GET["date2"]."&orderby=event_date&dir=".$dir."'>Event Date</a></th>
     <th><a href= 'http://192.168.0.49/intern/index.php?page=".$_GET["page"]."&date1=".$_GET["date1"]."&date2=".$_GET["date2"]."&orderby=bdm_name&dir=".$dir."'>BDM Name</th>
     <th><a href= 'http://192.168.0.49/intern/index.php?page=".$_GET["page"]."&date1=".$_GET["date1"]."&date2=".$_GET["date2"]."&orderby=event_type&dir=".$dir."'>Event Performed</th>
     <th><a href= 'http://192.168.0.49/intern/index.php?page=".$_GET["page"]."&date1=".$_GET["date1"]."&date2=".$_GET["date2"]."&orderby=completed&dir=".$dir."'>Completed</th>
   </tr>";

while($row = mysql_fetch_array($result))
    {
      echo "<tr>";
      echo "<td>" . $row['id'] . "</td>";
      echo "<td>" . date( "m/d/Y", strtotime($row['event_date'])) . "</td>";
      echo "<td>" . $row['bdm_name'] . "</td>";
      echo "<td>" . $row['event_type'] . "</td>";
      echo "<td>" . $row['completed'] . "</td>";
      echo "</tr>";
    }
 echo "</table>";

对于分页，我使用：

$page = (intval($_GET['page'])>0) ? $_GET['page'] : 2;
$recordPerPage= '30';
$startPoint = ($page - 1)*$recordPerPage;
$result = mysql_query("SELECT count(*) cnt FROM ` admin_crmf_poc_event_history` where $condition");
        $row = mysql_fetch_array($result);
        $num_rows = $row["cnt"];

$result = mysql_query("SELECT * FROM ` admin_crmf_poc_event_history` where $condition $ord LIMIT $startPoint,$recordPerPage");
        $totalPages=ceil($num_rows/$recordPerPage);

---

我想添加的图像看起来像是用于asc的desc和无操作的。这样，如果我单击desc的标题链接，desc图像将显示，asc和其他未单击的标题链接的相同现象将显示无操作的图像。

看起来您已经拥有使用这些值有条件地显示图像所需的所有数据。对于每个标题，只需有条件地添加正确的图像

比如

$headings = array(
    'id'         => 'Id',
    'event_date' => 'Event Date',
    'bdm_name'   => 'BDM Name',
    'event_type' => 'Event Performed',
    'completed'  => 'Completed'
);

$actionImages = array(
    'noaction' => 'noaction.png',
    'asc'  => 'ascending.png',
    'desc' => 'descending.png',
);

$currentDirection = $_REQUEST['dir'];
$defaultDirection = 'desc';
$orderByColumn    = $_REQUEST['orderby'];

echo '<table  width="100%"><tr>';

// For each heading, add to table
foreach ($headings as $column => $label) {
    // Determine action image to show
    if ($orderByColumn == $column) {
        $actionImg = (!empty($currentDirection)) ? $actionImages[$currentDirection] : $actionImages[$defaultDirection];
    } else {
        $actionImg = $actionImages['noaction'];
    }

    echo '<th><img src="' . $actionImg . '">'
        . '<a href="http://192.168.0.49/intern/index.php?page='
        . $_GET['page'] . '&date1=' . $_GET['date1'] . '&date2=' . $_GET['date2']
        . '&orderby=' . $column . '&dir=' . $dir . '">'
        . $label . '</th>';
}

echo '</tr>';

$headers=数组(
'id'=>'id'，
“事件日期”=>“事件日期”，
'bdm_name'=>'bdm name'，
“事件类型”=>“已执行事件”，
“已完成”=>“已完成”
);
$actionImages=array(
'noaction'=>'noaction.png'，
'asc'=>'升序.png'，
'desc'=>'descending.png'，
);
$currentDirection=$_请求['dir']；
$defaultDirection='desc'；
$orderByColumn=$_请求['orderby']；
回声'；
//对于每个标题，添加到表中
foreach（$列的标题=>$标签）{
//确定要显示的动作图像
如果（$orderByColumn==$column）{
$actionImg=（！empty（$currentDirection））？$actionImages[$currentDirection]：$actionImages[$defaultDirection]；
}否则{
$actionImg=$actionImages['noaction']；
}
回声“
. ''
.$标签'；
}
回声'；

我还没有测试过这段代码，但它应该能让您了解如何实现所需的功能

$headings = array(
    'id'         => 'Id',
    'event_date' => 'Event Date',
    'bdm_name'   => 'BDM Name',
    'event_type' => 'Event Performed',
    'completed'  => 'Completed'
);

$actionImages = array(
    'noaction' => 'noaction.png',
    'asc'  => 'ascending.png',
    'desc' => 'descending.png',
);

$currentDirection = $_REQUEST['dir'];
$defaultDirection = 'desc';
$orderByColumn    = $_REQUEST['orderby'];

echo '<table  width="100%"><tr>';

// For each heading, add to table
foreach ($headings as $column => $label) {
    // Determine action image to show
    if ($orderByColumn == $column) {
        $actionImg = (!empty($currentDirection)) ? $actionImages[$currentDirection] : $actionImages[$defaultDirection];
    } else {
        $actionImg = $actionImages['noaction'];
    }

    echo '<th><img src="' . $actionImg . '">'
        . '<a href="http://192.168.0.49/intern/index.php?page='
        . $_GET['page'] . '&date1=' . $_GET['date1'] . '&date2=' . $_GET['date2']
        . '&orderby=' . $column . '&dir=' . $dir . '">'
        . $label . '</th>';
}

echo '</tr>';