php增量变量与onclick

Question

我想使用onclick函数来增加变量[增加变量付费]

默认为0，我希望以1递增。

我试试这段代码：onclick ='paid ++'但是没有用......

My Code

foreach($query as $index=>$row) {
    echo ($colorCount++%2) ? "<tr class='alt'>" : "<tr>";
    echo "<td class='" . getPaidColor($row['paid']) . "' onclick='paid++ '></td>";
    echo "<td class='" . getDelayColor($row['hour']) . "' onclick='postDeleteForm(" . $index . ")'></td>";
    foreach($columns as $column) {
        echo "<td>" . $row[$column] . "</td>";
    }
}