按提交按鈕后的空白頁，所有字段均已填寫

Question

如標題所示，我有一個供用戶創建項目的頁面和另一個頁面將其添加到我的數據庫中。 但是，當我在表單字段為空的情況下按提交時，它發布到的頁面不是空白的。 但是當我在填寫字段的情況下提交時，它只是顯示一個沒有任何錯誤的空白頁面，我查看了兩頁代碼但似乎找不到任何錯誤。 也許這里有人可以幫助我？ 謝謝。

//提交數據的頁面上的代碼。

if ($_POST['projectTitle'] != "" && $_POST['projectStatus'] != "" && $_POST['projectDesc'] != "" && $_POST['projectDeliv'] != "" && $_POST['year'] != "" && $_POST['month'] != "" && $_POST['day'] != "" && $_POST['projectSS'] != "") {

        $host = "localhost";
        $user = "root";
        $pass = "";
        $db = "fyp1";

        $pt = $_POST['projectTitle'];
        $ps = $_POST['projectStatus'];
        $pdes = $_POST['projectDesc'];
        $pdel = $_POST['projectDeliv'];
        $date = $_POST['year'] . "-" . $_POST['month'] . "-" . $_POST['day'];
        $pss = $_POST['projectSS'];
        date_default_timezone_set('UTC+8');
        $cDate = date('Y-m-d');
        $uid = $_SESSION['id'];

        $link = mysqli_connect($host, $user, $pass, $db) or die(mysqli_error());
        $query = "SELECT * FROM project WHERE project_title = $pt AND project_description = $pdes AND project_deliverables = $pdel AND project_skillset = $pss";
        $dub = mysqli_query($link, $query) or die(mysqli_connect_error($link));

        if (mysqli_num_rows($dub) == 0) {

            $insertQ = "INSERT INTO project(project_title,project_description,project_deliverables,project_start,project_end,project_skillset,project_status)
                VALUES ('$pt','$pdes','$pdeliv','$cDate','$date','$pss',$ps)";
            mysqli_query($link, $insertQ) or die(mysqli_connect_error($link));

            $getPID = "SELECT * FROM project WHERE project_title = $pt AND project_description = $pdes AND project_deliverables = $pdel AND project_start = $cDate AND projecct_end = $date AND project_skillset = $pss";
            $pid = mysqli_query($link, $getPID) or die(mysqli_connect_error($link));
            if (mysqli_num_rows($pid) == 1) {
                while ($row = mysqli_fetch_array($pid)) {
                    $proid = $row['project_id'];
                    $insertF = "INSERT INTO user_has_project(user_id,project_id) VALUES ('" . $uid . "','" . $proid . "')";
                    mysqli_query($link,$insertF) or die(mysqli_connect_error($link));
                    $message = "<p>Project Successfully Added!</p>";
                    $message .= "<a href='index.php'>Back</a>";
                    $a = true;
                }
            } else {
                $message = "<p>Project Failed To Be Added!</p>";
                $message .= "<a href='createProject.php'>Back</a>";
                $a = false;
            }
        } else {
            $message = "<p>Duplicate Project Found!</p>";
            $message .= "<a href='createProject.php'>Back</a>";
            $a = false;
        }
    } else {
        $message = "<p>Please Fill Up All Fields When Creating A Project!</p>";
        $message .= "<a href='createProject.php'>Back</a>";
        $a = false;
    }

// 帶有表單的頁面上的代碼

    <div id="content">
        <?php if ($a == false) {
        ?>
                <h2 id="registerFont">Create Project</h2>
                <form name="createProject" method="post" action="doCreateProject.php" onSubmit="return validateForm(this);">
                    <fieldset>
                        <table>
                            <tr>
                                <th colspan="4"><h2>New Project</h2></th>
                            </tr>
                            <tr>
                                <th colspan="4"><hr /></th>
                            </tr>
                            <tr>
                                <td><label for="projectTitle">Project Title:</label></td><td><input name="projectTitle" type="text" /></td>
                                <td><label for="projectStatus">Project Status:</label></td>
                                <td><select name="projectStatus">
                                <?php while ($row = mysqli_fetch_array($result1)) {
                                ?>
                                    <option value="<?php echo $row['status_id']; ?>" ><?php echo $row['status_type']; ?></option>
                                <?php } ?>
                            </select></td>
                    </tr>
                    <tr>
                        <td><label for="projectDesc">Project Description:</label></td><th colspan="3"><textarea name="projectDesc" rows="5" cols="40" ></textarea></th>
                    </tr>
                    <tr>
                        <td><label for="projectDeliv">Project Deliverables:</label></td><th colspan="3"><textarea name="projectDeliv" rows="5" cols="40" ></textarea></th>
                    </tr>
                    <tr>
                        <td>Start Date:</td><td><?php echo $date; ?></td>
                    </tr>
                    <tr>
                        <td>End Date : </td>
                        <th colspan="3" align="left">
                            <select name="year">
                                <option>---Year---</option>
                                <?php for ($i = $cYear; $i < ($cYear + 100); $i++) {
                                ?>
                                    <option value="<?php echo $i; ?>"><?php echo $i; ?></option>
                                <?php } ?>
                            </select>
                            <select name="month">
                                <option>---Month---</option>
                                <?php while ($rows = mysqli_fetch_array($result)) {
                                ?>
                                    <option value="<?php echo $rows['month_id']; ?>"><?php echo $rows['month']; ?></option>
                                <?php } ?>
                            </select>
                            <select name="day">
                                <option>---Day---</option>
                                <?php for ($i = 1; $i < 32; $i++) {
                                ?>
                                    <option value="<?php echo $i ?>"><?php echo $i ?></option>
                                <?php } ?>
                            </select>
                        </th>
                    </tr>
                    <tr>
                        <td><label for="projectSS">Project Skill Set:</label></td><td><input name="projectSS" type="text"/></td><th colspan="2"><small>(Please Separate By Comma)</small></th>
                    </tr>
                </table>
            </fieldset>
            <br />
            <input name="submit" type="submit" value="Create Project" />
        </form>
        <?php
                            } else {
                                echo $message;
                            }
        ?>
                        </div>

Answer 1

我設法解決了這個問題。 查詢數據庫時，在我的 SELECT 語句中，我忘記添加“”的變量。 例如 SELECT * FROM project WHERE project_title = '$variable';

無論如何。 感謝那些幫助過的人。 對此，我真的非常感激。