Question

<!DOCTYPE html>
<body>
  <?php

        function fetch_data(){
            $output = '';
            $conn = mysqli_connect("localhost", "root", "", "something");
            $ID = $_COOKIE['ID'];

            $sql_0 = "SELECT users.name, leave_form.type_of_leave, leave_form.application_date,leave_form.leave_days,  
                                leave_form.starting_date,leave_form.end_date,leave_form.reporting_date ,leave_form.Approval FROM users,leave_form WHERE
                                    users.ID=leave_form.ID && leave_form.Approval='Denied' ";

                                    $result = mysqli_query($conn, $sql_0);


                                    while($row = mysqli_fetch_array($result)){
                                        $output .='
                                        <form method="POST" action="../auth/processes.php">
                                        <tr><td><input type="text" value= '.$row["name"].' readonly class="form-control"/></td>
                                        <td><input type="text" value="'.$row["type_of_leave"].'" readonly class="form-control"/></td>
                                        <td><input type="timestamp" value="'.$row["application_date"]. '" readonly class="form-control"/></td>
                                        <td><input type="number" value="'.$row["leave_days"].'" readonly class="form-control"/></td>
                                        <td><input type="date" value="'.$row["starting_date"].'" readonly class="form-control"/></td>
                                        <td><input type="date" value="'.$row["end_date"]. '" readonly class="form-control"/></td>
                                        <td><input type="text" value="'.$row["Approval"]. '" readonly class="form-control"/></td>
                                        <td><a href="../auth/authenticate.php"><img src="../assets/images/send.png" alt="post" height="40px"/></a></td></tr></form>
                                        </form>';
                                    }
                                    return $output;

                                }
                                if(isset($_POST["generate_pdf"])){
                                    require_once('../tcpdf/tcpdf.php');
                                    $obj_pdf = new TCPDF ('P', PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
                                    $obj_pdf -> SetCreator(PDF_CREATOR);
                                    $obj_pdf -> SetTitle("My first pdf");
                                    $obj_pdf -> SetHeaderData('', '', PDF_HEADER_TITLE, PDF_HEADER_STRING);
                                    $obj_pdf -> SetHeaderFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
                                    $obj_pdf -> SetFooterFont(Array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
                                    $obj_pdf -> SetDefaultMonospacedFont('helvetica');
                                    $obj_pdf -> SetFooterMargin(PDF_MARGIN_FOOTER);
                                    $obj_pdf -> SetMargins(PDF_MARGIN_LEFT, '10', PDF_MARGIN_RIGHT);
                                    $obj_pdf -> setPrintHeader(false);
                                    $obj_pdf -> setPrintFooter(false);
                                    $obj_pdf -> setAutoPageBreak(TRUE, 10);
                                    $obj_pdf -> SetFont('helvetica', '', 11); 
                                    $obj_pdf -> AddPage();
                                    $content = '';
                                    $content .= '

                                    <table border="1" cellspacing="0" cellpadding="3">
                                        <tr>
                                            <th width = "14.28%" >Name</th>
                                            <th width = "14.28%" >Type of Leave</th>
                                            <th width = "14.28%" >Application Date</th>
                                            <th width = "14.28%" >Leave Days</th>
                                            <th width = "14.28%" >Starting Date</th>
                                            <th width = "14.28%" >End Date</th>
                                            <th width = "14.28%" >Approval</th>
                                        </tr>
                                    ';
                                    $content .= fetch_data();
                                    $content .= '</table>';
                                    $obj_pdf -> writeHTML($content);
                                    $obj_pdf -> Output('file.pdf', 'I');
                                }
        ?>
    <div class="col-md-12" align="right">
        <form method="post">
            <input type="submit" name="generate_pdf" value="Generate PDF"/>
        </form>
    <table  class="table table-striped table-bordered troom">
    <thead>
        <tr>
            <th>Applicant Name</th>
            <th>Type of Leave</th>
            <th>Application Date</th>
            <th>Days Applied For</th>
            <th>Starting Date</th>
            <th>End Date</th>
            <th>Approval</th>
        </tr>
    </thead>
    <tbody>
    <?php
        echo fetch_data();
    ?>
    </tbody>
</table>

</body>
</html>

上述代码在尝试将我的html表格转换为pdf时会产生以下错误：任何帮助都会有所帮助

注意：未定义的索引：第16916行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的行

警告：array_push（）期望参数1为数组，在第16918行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中给出null

注意：未定义的索引：第16498行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的thead

警告：第18807行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的非法字符串偏移'url'

注意：未定义的索引：第19478行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的trid

警告：在第19478行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中为foreach（）提供的参数无效

注意：未定义的索引：19507行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的trid

警告：count（）：参数必须是在19507行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中实现Countable的数组或对象

注意：未定义的索引：第19510行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的trid

警告：在第19510行的C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中为foreach（）提供的参数无效

注意：第19720行C：\ xampp \ htdocs \ novel \ tcpdf \ tcpdf.php中的未定义索引：old_cell_padding

TCPDF错误：某些数据已经输出，无法发送PDF文件

Answer 1

我看到的一个主要问题是，即使您想要生成PDF，也要将HTML输出到页面。这是导致此错误的原因：

TCPDF错误：某些数据已经输出，无法发送PDF文件

您可以通过转到TCPDF示例并在文件的开头或结尾插入文本或HTML元素来测试它。

tcpdf：将html表转换为pdf

1 个答案: