解析错误：语法错误：意外＆＃39;}＆＃39;

Question

标题中的错误有一个小问题，但所有括号都匹配，所以我不知道它为什么显示此错误。谁知道为什么？

代码是：

<?php

    session_start();
    require_once 'db/connect.php';
    //require_once 'entryformsuccess.php';
    echo $_SESSION['Username'] . ' logged in successfully ' . ' <br> ';

        if ($student_delete = $con->query("SELECT Student.Form, Teacher.Form, Forename, Surname, Student_ID, Username " .
                                            "FROM student, teacher " . 
                                                "WHERE Student.Form = Teacher.Form AND Teacher.Username = '" . $_SESSION['Username'] . "'")) {

            if (isset($_POST['Student_ID']))    {   
                $checkbox = $_POST['checkbox']; 

                for ($i=0;$i<count($checkbox);$i++) {
                    $del_student = $checkbox[$i];
                    $query= $con->query("DELETE FROM users WHERE Student_ID = 'Student_ID'")


                }                           

            }
        }       

?>

Answer 1

您错过了

末尾的;

$query= $con->query("DELETE FROM users WHERE Student_ID = 'Student_ID'")

Answer 2

请更新它。

<?php

        session_start();
        require_once 'db/connect.php';
        //require_once 'entryformsuccess.php';
        echo $_SESSION['Username'] . ' logged in successfully ' . ' <br> ';

            if ($student_delete = $con->query("SELECT Student.Form, Teacher.Form, Forename, Surname, Student_ID, Username " .
                                                "FROM student, teacher " . 
                                                    "WHERE Student.Form = Teacher.Form AND Teacher.Username = '" . $_SESSION['Username'] . "'")) {

                if (isset($_POST['Student_ID']))    {   
                    $checkbox = $_POST['checkbox']; 

                    for ($i=0;$i<count($checkbox);$i++) {
                        $del_student = $checkbox[$i];
                        $query= $con->query("DELETE FROM users WHERE Student_ID = 'Student_ID'");


                    }                           

                }
            }       

    ?>

Answer 3

我认为你在这行末尾缺少一个分号：

$query= $con->query("DELETE FROM users WHERE Student_ID = 'Student_ID'");