Php 在输入文本中输入姓名、电子邮件、用户名或D.O.B时，如何显示数据？_Php_Html_Mysqli

Php 在输入文本中输入姓名、电子邮件、用户名或D.O.B时，如何显示数据？

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Php 在输入文本中输入姓名、电子邮件、用户名或D.O.B时，如何显示数据？,php,html,mysqli,Php,Html,Mysqli,Welcome.php <?php session_start(); if (!isset($_SESSION['id'])) { header('location:login.php'); } ?> <!DOCTYPE html> <html> <body> <?php include_once 'connect.php'; $query = mysqli_query($my

Welcome.php

<?php
session_start();

if (!isset($_SESSION['id'])) {
    header('location:login.php');
}
?>
<!DOCTYPE html>
<html>
    <body>
        <?php
        include_once 'connect.php';
        $query = mysqli_query($mysqli, "select * from `users` where userid='" . $_SESSION['id'] . "'");
        $row = mysqli_fetch_array($query);
        echo 'Welcome - ' . $row['username'];
        ?>

        <br>
        <a href="logout.php">Logout</a>
        <br><br>

        <?php
        include_once 'connect.php';
        $result = mysqli_query($mysqli, "SELECT * FROM users");

        echo "<table border='1'>
                        <tr>
                        <th>User_ID</th>
                        <th>Name</th>
                        <th>Username</th>
                        <th>E-mail</th>
                        <th>Department</th>
                        <th>Date_of_birth</th>
                        <th>Age</th>
                        <th>Image</th>
                        <th>Action</th>
                        <th>Action</th>
                        </tr>";

        while ($row = mysqli_fetch_array($result)) {
            echo "<tr>";
            echo "<td>" . $row['userid'] . "</td>";
            echo "<td>" . $row['name'] . "</td>";
            echo "<td>" . $row['username'] . "</td>";
            echo "<td>" . $row['email'] . "</td>";
            echo "<td>" . $row['department'] . "</td>";
            echo "<td>" . $row['Date_of_birth'] . "</td>";
            echo "<td>" . $row['age'] . "</td>";
            echo "<td><img alt='image' style='width:100px;height:50px;' src='upload/" . $row['filename'] . "'></td>";
            echo "<td> <a href='editform.php?id=" . $row['userid'] . "'>Edit</a></td>";
            echo "<td> <a href='deleteform.php?id=" . $row['userid'] . "'>Delete</a></td>";
            echo "</tr>";
        }
        echo "</table>";

        include_once 'connect.php';
        if (isset($_POST["happy"])) {

            if (empty($_POST["happy"])) { //not empty name
                echo '<br>';
                echo "No letter entered";
            } else {

                $id = $_GET['id'];
                $sql = "SELECT * FROM `users` WHERE userid='$id'";
                $result = mysqli_query($mysqli, $sql);
                $row = mysqli_fetch_array($result);
                $sql = "select name, username, email, Date_of_birth from `users` where (name LIKE '%$name%' OR username LIKE '%$name%' OR email LIKE '%$name%' OR Date_of_birth LIKE '%$name%')";
                if (mysqli_query($mysqli, $sql) === TRUE) {
                    print_r($id);
                } else {
                    echo 'No record found';
                }
            }
        }
        ?>
        <form method="post">
            <br>
            Search: <input type="text" name="happy"><br><br>
            <input type="submit" value="Submit">
        </form>
    </body>
</html>


我已经更新了你的代码，请尝试一下
<?php
session_start();

if (!isset($_SESSION['id'])) {
    header('location:login.php');
}
?>
<!DOCTYPE html>
<html>
    <body>
        <?php
        include_once 'connect.php';
        $query = mysqli_query($mysqli, "select * from `users` where userid='" . $_SESSION['id'] . "'");
        $row = mysqli_fetch_array($query);
        echo 'Welcome - ' . $row['username'];
        ?>

        <br>
        <a href="logout.php">Logout</a>
        <br><br>

        <?php
        include_once 'connect.php';
        $result = mysqli_query($mysqli, "SELECT * FROM users");

        echo "<table border='1'>
                        <tr>
                        <th>User_ID</th>
                        <th>Name</th>
                        <th>Username</th>
                        <th>E-mail</th>
                        <th>Department</th>
                        <th>Date_of_birth</th>
                        <th>Age</th>
                        <th>Image</th>
                        <th>Action</th>
                        <th>Action</th>
                        </tr>";

        while ($row = mysqli_fetch_array($result)) {
            echo "<tr>";
            echo "<td>" . $row['userid'] . "</td>";
            echo "<td>" . $row['name'] . "</td>";
            echo "<td>" . $row['username'] . "</td>";
            echo "<td>" . $row['email'] . "</td>";
            echo "<td>" . $row['department'] . "</td>";
            echo "<td>" . $row['Date_of_birth'] . "</td>";
            echo "<td>" . $row['age'] . "</td>";
            echo "<td><img alt='image' style='width:100px;height:50px;' src='upload/" . $row['filename'] . "'></td>";
            echo "<td> <a href='editform.php?id=" . $row['userid'] . "'>Edit</a></td>";
            echo "<td> <a href='deleteform.php?id=" . $row['userid'] . "'>Delete</a></td>";
            echo "</tr>";
        }
        echo "</table>";

        include_once 'connect.php';
        if (isset($_POST["happy"])) {

            if (empty($_POST["happy"])) { //not empty name
                echo '<br>';
                echo "No letter entered";
            } else {

                $id = $_GET['id'];
                $sql = "SELECT * FROM `users` WHERE userid='$id'";
                $result = mysqli_query($mysqli, $sql);
                $row = mysqli_fetch_array($result);
                $sql = "select name, username, email, Date_of_birth from `users` where (name LIKE '%$name%' OR username LIKE '%$name%' OR email LIKE '%$name%' OR Date_of_birth LIKE '%$name%')";
                if (mysqli_query($mysqli, $sql) === TRUE) {
                    print_r($id);
                } else {
                    echo 'No record found';
                }
            }
        }
        ?>
        <form method="post">
            <br>
            Search: <input type="text" name="happy"><br><br>
            <input type="submit" value="Submit">
        </form>
    </body>
</html>

<?php
        session_start();
        if (!isset($_SESSION['id'])) {
            header('location:login.php');
        }
    ?>
    <!DOCTYPE html>
    <html>
    <body>
    <?php
    include_once 'connect.php';
     $query=mysqli_query($mysqli,"select * from `users` where userid='".$_SESSION['id']."'");
    $row=mysqli_fetch_array($query);
    echo 'Welcome - '.$row['username'];
    ?>
    <a href="logout.php">Logout</a>
    <?php
     //include_once 'connect.php';
    $result = mysqli_query($mysqli,"SELECT * FROM users");
    echo "<table border='1'>
    <tr>
       <th>User_ID</th>
       <th>Name</th>
       <th>Username</th>
       <th>E-mail</th>
       <th>Department</th>
       <th>Date_of_birth</th>
       <th>Age</th>
       <th>Image</th>
       <th>Action</th>
        <th>Action</th>
    </tr>";
     while($row = mysqli_fetch_array($result))
    {
      echo "<tr>";
     echo "<td>" . $row['userid'] . "</td>";
       echo "<td>" . $row['name'] . "</td>";
       echo "<td>" . $row['username'] . "</td>";
      echo "<td>" . $row['email'] . "</td>";
      echo "<td>" . $row['department'] . "</td>";
     echo "<td>" . $row['Date_of_birth'] . "</td>";
    echo "<td>" . $row['age'] . "</td>";
     echo "<td><img alt='image' style='width:100px;height:50px;' src='upload/".$row['filename']."'></td>";
     echo "<td> <a href='editform.php?id=" . $row['userid'] . "'>Edit</a></td>";
     echo "<td> <a href='deleteform.php?id=" . $row['userid'] . "'>Delete</a></td>";
      echo "</tr>";
       }
      echo "</table>";
    ?>
      <?php

       //include_once 'connect.php';   
        if(isset($_POST["happy"])){
       if(empty($_POST["happy"])){ //not empty name
          echo '<br>';
              echo "No letter entered";
        }else {
            $name = $_POST["happy"];
             $id = $_GET['id'];
              $sql = "SELECT * FROM `users` WHERE userid='$id'";
              $result = mysqli_query($mysqli, $sql);
              $row = mysqli_fetch_array($result);
              $sql="select name, username, email, Date_of_birth from `users` where (name LIKE '%$name%' OR username LIKE '%$name%' OR email LIKE '%$name%' OR Date_of_birth LIKE '%$name%')";
           if (mysqli_query($mysqli, $sql) === TRUE) {
                            print_r($id);
      }else {
     echo 'No record found';
       }

     }

     }

     ?>

            <form method="post">
                <br>
                Search: <input type="text" name="happy"><br><br>
                <input type="submit" value="Submit">
            </form>                 
        </body>
    </html>


问题或错误请放在此处注意：未定义索引：id在C:\xampp\htdocs\registration\u form\u 2\welcome.php第78行注意：未定义变量：名称在C:\xampp\htdocs\registration\u form\u 2\welcome.php第82行注意：未定义变量：名称在C:\xampp\htdocs\registration\u form\u 2\welcome.php第82行注意：未定义变量：第82行C:\xampp\htdocs\registration\u form\u 2\welcome.php中的名称注意：未定义变量：第82行C:\xampp\htdocs\registration\u form\u 2\welcome.php中的名称以上错误我得到的第一件事不包括“connect.php”；很多次。我不明白怎么做请帮助我sir注意：未定义的变量：_sessionin C:\xampp\htdocs\registration\u form\u 2\welcome.php第3行注意：未定义的索引：id in C:\xampp\htdocs\registration\u form\u 2\welcome.php第61行请帮助我sir如何做请立即尝试未定义的索引：id in第59行的C:\xampp\htdocs\registration\u form\u 2\welcome.php