php - 用逗号(,)将数组数据存储到字符串中

Question

[!]问题:每当我从前端获取数据并尝试插入数据库时​​...数据将作为单个字母插入到选修单元格中...但我真正需要的是插入整个数据在选修单元格中，用逗号(,)分隔

<?php
include_once '../../config/db_connection.php';
include_once '../../config/functions.php';
include "autho.php";
include('../db_mysqli.php');
if (isset($_POST['submit'])) {
$username1 = $_POST['username'];
$username1 = preg_replace('#<script(.*?)>(.*?)</script>#is', '', $username1);
$rollno = $_POST['register_no'];
$rollno = preg_replace('#<script(.*?)>(.*?)</script>#is', '', $rollno);

$subjectcode = implode(',', $_POST['subject']);   ;

date_default_timezone_set("Asia/Kolkata");

$today = date('g:ia \o\n l jS F Y');

$rollnos = array_map('strlen', $rollno);
$rollnos = min($rollnos);
if ($rollnos < 6) {
    $error = 'Roll Number is too short.';
} else {
}
if (!isset($error)) {
    for ($i = 0; $i < count($rollno); $i++) {
$sql = "UPDATE students SET elective='$subjectcode[$i]' WHERE register_number='$rollno[$i]'";
$result = mysqli_query($conn, $sql);
if ($result) {
header('Location:./?edu_camp=elective_student_update&success');

        } else {
             header('Location:./?edu_camp=elective_student_update&fail');
        }
    }

} else {
    //echo "Sorry! something Wrong.";
}

}
?>

Answer 1

正如评论中提到的，您可以将数组内爆到字符串中并将其插入( docs )。

此外，您正在使用 MySQLi，但没有使用您真正应该使用的绑定(bind)参数 ( docs )。

// Concatenate all values together
$commaSeparatedList = implode(',',$subjectcode);
// Prepare your statement
$stmt = $mysqli->prepare("UPDATE students SET elective=? WHERE register_number=?");
// Bind the relevant parameters (not sure what the where clause should be here)
$stmt->bind_param('si', $commaSeparatedList, $i);
// Check if rows were affected
if ($mysqli->affected_rows > 0) {
   // Success, rows were changed
}
// Execute and close the statement object
$stmt->execute();
$stmt->close();