我试图使用PHP从select下拉列表中插入多个值，但它'；s仅取最后选定的值

我尝试过使用内爆和foreach函数，但它仍然使用最后选择的值

这是php插入代码

<?php

if (isset($_POST['register'])) {

    $research = $_POST['research'];
    $reg = $_POST['RegNo'];
    $topic = $_POST['topic'];
    $year = $_POST['year'];
    $staff = $_POST['staff'];

    foreach ($staff as $choice) {
        require 'connectdb.php';
        $statement = $conn->prepare('INSERT INTO research ( Name, Topic, Year, RegNo, staffID) VALUES (?,?,?,?,?);');
        $statement->bind_param('sssss', $researchh, $topicc, $yearr, $regg, $stafff);
        $researchh = $research;
        $topicc = $topic;
        $yearr = $year;
        $regg = $reg;
        $stafff = $choice;
    }

    if ($statement->execute() == false) {
        if ($conn->errno === 1062) {
            header('Location:?exists');
        }
    } else {
        header('Location:?newstudentTopic');
    }

}
?>

<?php

if (isset($_POST['register'])) {
require 'connectdb.php';

$research = $_POST['research'];
$reg = $_POST['RegNo'];
$topic = $_POST['topic'];
$year = $_POST['year'];
$staff = $_POST['staff'];
$isSuccess = 1;
foreach ($staff as $choice) {
    $statement = $conn->prepare('INSERT INTO research ( Name, Topic, Year, RegNo, staffID) VALUES (?,?,?,?,?);');
    $statement->bind_param('sssss', $researchh, $topicc, $yearr, $regg, $stafff);
    $researchh = $research;
    $topicc = $topic;
    $yearr = $year;
    $regg = $reg;
    $stafff = $choice;
    if ($statement->execute() == false) {
       $isSuccess = 0;
    }
}


    if (!$isSuccess) {
        header('Location:?exists');
    }
    else {
    header('Location:?newstudentTopic');
    }

}
?>

这是表单字段：

<div class="col-md-6">

    <label for="gender">Supervior</label>
    <select class="form-control selectpicker border border-info" id="staff" required name="staff[]"
            data-live-search="true" multiple data-max-options="2" multiple="multiple">

        <option value=""> Allocate Supervisor</option>

        <?php
        require 'connectdb.php';
        $statement = $conn->prepare('SELECT staffid,fname,lname from staff');
        $statement->execute();
        $statement->bind_result($staffid, $fname, $lname);
        $statement->store_result();
        while ($statement->fetch()) {
            ?>
            <option value="<?php echo $staffid ?>"><?php echo $fname . ' ' . $lname ?></option>
            <?php
        }
        $statement->close();
        $conn->close();
        ?>
    </select>

</div>

监管者维度
分配主管

将您的

$statement->execute（）

放在您的

foreach

循环中，您就可以开始了：）

你可以这样做：

// needs to be included only once
require 'connectdb.php';

// you can use this multiple times
$statement = $conn->prepare('INSERT INTO research ( Name, Topic, Year, RegNo, staffID) VALUES (?,?,?,?,?);');

$success = true;
foreach ($staff as $choice) {
    $researchh = $research;
    $topicc = $topic;
    $yearr = $year;
    $regg = $reg;
    $stafff = $choice;

    $statement->bind_param('sssss', $researchh, $topicc, $yearr, $regg, $stafff);

    $success = $statement->execute() && $success;

    // Do this if you want to stop inserting after one fails
    // if($success === false) {
    //     break;
    // }
}

if ($success) {
    header('Location:?exists');
} else {
    header('Location:?newstudentTopic');
}
exit; // thx @halfer :)

---

如果只想在没有一个执行失败的情况下插入，请查看事务：

execute命令在循环之外，也不要在循环中包含“connectdb.php”或使用require_一次。

您应该

准备
sql一次，然后
执行
多次~这是
准备语句
风格之美的一部分

您应该测试所需字段在POST数组中是否可用-下面我创建了一个要测试的字段数组~第一个测试确定是否有任何所需字段为空，第二个测试确定是否有人试图将其他参数注入POST数组

您应该将
require
数据库连接包含一次，而不是包含在循环中

最后，只需循环遍历
staff
数组，并为每个迭代执行查询

<?php 
    try{
        $results=[];
        $fields=['research','RegNo','topic','year','staff','register'];

        foreach( $fields as $field ) {
            if( empty( $_POST[ $field ] ) ) {
                throw new Exception( sprintf( 'Missing field "%s"', $field ) );
            }
        }

        foreach( $_POST as $field ){
            if( !in_array( $field, $fields ) ) {
                throw new Exception( sprintf('Unknown field "%s"', $field ) );
            }
        }
        /* include the db connection once, NOT in the loop */
        require 'connectdb.php';

        $research=$_POST['research'];
        $reg=$_POST['RegNo'];
        $topic=$_POST['topic'];
        $year=$_POST['year'];
        /* this is a multiple field - array */
        $arr_staff=$_POST['staff'];

        /* Create the sql statement once - NOT in the loop */
        $sql='INSERT INTO research ( `Name`, `Topic`, `Year`, `RegNo`, `staffID`) VALUES (?,?,?,?,?);'
        $stmt=$conn->prepare( $sql );

        if( !$stmt )throw new Exception('Failed to prepare SQL');
        $stmt->bind_param('sssss', $research, $topic, $year, $reg, $staff );


        foreach( $arr_staff as $staff ){
            $results[]=$stmt->execute();
        }

        exit( header( 'Location: ?newstudentTopic' ) );

    } catch( Exception $e ){
        exit( $e->getMessage() );
    }
?>

您的代码中存在多个小故障。我已经对它进行了一些优化，并修复了与您的需求相关的问题。请让我知道它是否有效

我尝试过使用内爆和foreach函数，但它仍然使用最后选择的值

这是php插入代码

<?php

if (isset($_POST['register'])) {

    $research = $_POST['research'];
    $reg = $_POST['RegNo'];
    $topic = $_POST['topic'];
    $year = $_POST['year'];
    $staff = $_POST['staff'];

    foreach ($staff as $choice) {
        require 'connectdb.php';
        $statement = $conn->prepare('INSERT INTO research ( Name, Topic, Year, RegNo, staffID) VALUES (?,?,?,?,?);');
        $statement->bind_param('sssss', $researchh, $topicc, $yearr, $regg, $stafff);
        $researchh = $research;
        $topicc = $topic;
        $yearr = $year;
        $regg = $reg;
        $stafff = $choice;
    }

    if ($statement->execute() == false) {
        if ($conn->errno === 1062) {
            header('Location:?exists');
        }
    } else {
        header('Location:?newstudentTopic');
    }

}
?>

<?php

if (isset($_POST['register'])) {
require 'connectdb.php';

$research = $_POST['research'];
$reg = $_POST['RegNo'];
$topic = $_POST['topic'];
$year = $_POST['year'];
$staff = $_POST['staff'];
$isSuccess = 1;
foreach ($staff as $choice) {
    $statement = $conn->prepare('INSERT INTO research ( Name, Topic, Year, RegNo, staffID) VALUES (?,?,?,?,?);');
    $statement->bind_param('sssss', $researchh, $topicc, $yearr, $regg, $stafff);
    $researchh = $research;
    $topicc = $topic;
    $yearr = $year;
    $regg = $reg;
    $stafff = $choice;
    if ($statement->execute() == false) {
       $isSuccess = 0;
    }
}


    if (!$isSuccess) {
        header('Location:?exists');
    }
    else {
    header('Location:?newstudentTopic');
    }

}
?>


此外，
header（）
Location语句后面应该紧跟着一个exit，这样脚本就不会试图在之后继续执行。