Question

所以，我试图验证7个数字的ID。但是，我的代码不断返回$ idErr而不是$ id本身。我不知道为什么，因为我已经验证了其他所有工作，并在几个验证器中检查了我的正则表达式。有任何想法吗？ 注意：我输入的值是9876543，它在我使用的任何验证器中传递

请参阅//检查ID

<!DOCTYPE html>
<html>
    <!--
    Turnin page example
    This page demonstrates a turnin form.
    The user can type in their personal info and turn in a fake homework assignment.
    -->
    <head>
        <title>Turnin Page</title>
    </head>

    <body>
<?php

// define variables and set to empty values 
$studentname = $id = $assignment = $email = $cheat = " ";
$studentnameErr = $idErr = $assignmentErr = $emailErr = $cheatErr = " ";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    //your code goes here. 


    function test($data){
        $data = trim($data);
        $data = stripslashes($data);
        $data = htmlspecialchars($data);
        return $data;
    }

    // check name
    if(empty($_POST["studentname"])) {
        $studentnameErr = "You need a name!";

    }elseif (!preg_match("/[a-z A-Z ]*$/",$studentname)) {
            $studentnameErr = "Only letters and white space allowed"; 
        }else{
        $studentname = test($_POST["studentname"]);
        }

    // check id
    if(empty($_POST["id"])) {
        $idErr = "You need an id!";
    } elseif(!preg_match("/([0-9]{7})/",$id)){
        $idErr = "You need an id consisting of 7 numbers"; 
        } else{
            $id = test($_POST["id"]);
        }

    //check email 
    if(empty($_POST["email"])) {
        $emailErr = "You need an email!";
    }

    elseif(!preg_match("/[([a-z]{2}\d{4}a{1}@american.edu{1})]/", $email)) {
        $emailErr = "email needs to be: 2 consonants + 4 numbers + a@american.edu "; 

    } else{
        $email = test($_POST["email"]); 
        }

    //check assignment
    // check if a file has been uploaded and if the file name is hw1, hw2,
    if(empty($_POST["assignment"])) {
        $assignmentErr = "You need to submit an assignment!";
    } else{
        $assignment = test($_POST["assignment"]);

    }


    // check cheating

    if(empty($_POST["cheat"])) {
        $cheatErr = "You need to say you won't cheat!";
        } else{
            $cheat = test($_POST["cheat"]);
        }

    // note you need to use $_FILES["fileToUpload"]["tmp_name"]
    // to access your file. 


    }
?>
<h1>CSC 435 Turnin</h1>
        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" enctype="multipart/form-data">

            <fieldset>
                <legend>Personal Information</legend>
                <div>
                    Name: <input type="text" name="studentname"/>
                    <span class="error">* <?php echo $studentnameErr;?></span>
                </div>
                <div>
                    Student id: <input type="text" name="id" maxlength="7"/>
                    <span class="error">* <?php echo $idErr;?></span>
                </div>

                <div>
                    Student email: <input type="text" name="email"/>
                    <span class="error">* <?php echo $emailErr;?></span>
                </div>
            </fieldset>

            <fieldset>
                <legend>Assignment Information</legend>
                <div>
                    Assignment:
                    <label><input type="radio" name="assignment" value="1" /> 1</label>
                    <label><input type="radio" name="assignment" value="2" /> 2</label>
                    <label><input type="radio" name="assignment" value="3" /> 3</label>
                    <span class="error">* <?php echo $assignmentErr;?></span>
                </div>


                <div>
                    Code:
                    <input type="file" name="code" />
                </div>
            </fieldset>

            <div>
                <input type="checkbox" name="cheat" /> I promise I didn't cheat!
            </div>
            <input type="submit" />
        </form>

<?php
echo "<h2>Your Input:</h2>";
echo $studentname;
echo "<br>";
echo $id;
echo "<br>";
echo $email;
echo "<br>";
echo $assignment;
echo "<br>";
?>

</body>
</html>

Answer 1

因为您正在检查$id而未指定它。选中$_POST["id"]或将$id分配为$_POST["id"]值。

这会告诉你：

error_reporting(E_ALL);
ini_set('display_errors', '1');

注意：未定义的变量：第X行的文件中的id

Answer 2

尝试/^[a-z A-Z ]*$/而不是/[a-z A-Z ]*$/，添加^

PHP preg_match应返回true但返回false

2 个答案: