每位员工的总时间（以小时为单位）

Question

在我的 php mysql 报告中，我使用以下代码从 mysql 表中提取数据。一切工作正常，但我最终无法完成总和。有什么方法可以总结员工的工作时间。 （我尝试翻转，它不满足我的要求，任何专家都可以指导我如何处理循环，以便我可以获得如下图所示的输出

 $sql = "SELECT * FROM timetablw ORDER BY id DESC limit 30";
                    if($result = mysqli_query($link, $sql)){
                        if(mysqli_num_rows($result) > 0){
                            echo '<table class="table table-bordered table-striped">';
                                echo "<thead>";
                                    echo "<tr>";
                                        echo "<th>Emp-Id</th>";
                                        echo "<th>Name</th>";
                                        echo "<th>Company</th>";
                                        echo "<th>Date</th>";
                                        echo "<th>worktime</th>";
                    
                                    echo "</tr>";
                                echo "</thead>";
                                echo "<tbody>";
                                while($row = mysqli_fetch_array($result)){
                                    echo "<tr>";
                                        echo "<td>" . $row['empid'] . "</td>";
                                        echo "<td>" . $row['empname'] . "</td>";
                      echo "<td>" . $row['company1'] . "</td>";
                                        echo "<td>" . date('d-M-Y', strtotime($row['date1'])) . "</td>"; 
                                         echo "<td>" . $row['wrktime'] . "</td>";
                                      
                                       
                                    echo "</tr>";
                                }
                                echo "</tbody>";                            
                            echo "</table>";
                            // Free result set
                            mysqli_free_result($result);
                        } else{
                            echo '<div class="alert alert-danger"><em>No records were found.</em></div>';
                        }

Answer 1

要计算“工作时间”列的总和，您可以在循环之前初始化一个变量以累积值并在循环内更新它。这是代码的修改版本，其中包含总和计算：

$sql = "SELECT * FROM timetablw ORDER BY id DESC LIMIT 30";

if ($result = mysqli_query($link, $sql)) {
    if (mysqli_num_rows($result) > 0) {
        echo '<table class="table table-bordered table-striped">';
        echo "<thead>";
        echo "<tr>";
        echo "<th>Emp-Id</th>";
        echo "<th>Name</th>";
        echo "<th>Company</th>";
        echo "<th>Date</th>";
        echo "<th>worktime</th>";
        echo "</tr>";
        echo "</thead>";
        echo "<tbody>";

        $totalWorkTime = 0; // Initialize the variable for sum

        while ($row = mysqli_fetch_array($result)) {
            echo "<tr>";
            echo "<td>" . $row['empid'] . "</td>";
            echo "<td>" . $row['empname'] . "</td>";
            echo "<td>" . $row['company1'] . "</td>";
            echo "<td>" . date('d-M-Y', strtotime($row['date1'])) . "</td>";
            echo "<td>" . $row['wrktime'] . "</td>";

            // Update the sum variable
            $totalWorkTime += $row['wrktime'];

            echo "</tr>";
        }

        echo "</tbody>";

        // Display the sum row
        echo "<tfoot>";
        echo "<tr>";
        echo "<td colspan='4'><strong>Total Work Time:</strong></td>";
        echo "<td><strong>" . $totalWorkTime . "</strong></td>";
        echo "</tr>";
        echo "</tfoot>";

        echo "</table>";
        // Free result set
        mysqli_free_result($result);
    } else {
        echo '<div class="alert alert-danger"><em>No records were found.</em></div>';
    }
}

此修改包括一个变量

$totalWorkTime

，该变量在循环之前初始化并在循环内更新以累积值。然后，总和将显示在表页脚的新行中。根据需要调整格式。