PHP表单验证

我是PHP新手，请温和！

我试图用错误消息/确认消息来构建一个简单的PHP表单验证。 当我提交表格时，应该检查字段是否为空并显示相应的消息。 但它一直给我一个错误，我不知道为什么：

解析错误：语法错误，第6行的process.php中出现意外的T_IF

这里是过程php代码。

<form action="process.php" method="post">
First Name: <input type="text" name="fname"><br>
Last Name: <input type="text" name="lname"><br>
E-mail: <input type="text" name="email"><br>
<input type="hidden" name="submitted" value="1">
<input type="submit">
</form>

<?php
//If form was submitted

if ($_POST['submitted']==1) {
$errormsg = ""; //Initialize errors
    if ($_POST[fname]){
        $fname = $_POST[fname]; //If fname was entered
    }
    else{
        $errormsg = "Please enter first name";
    }
    if ($_POST[lname]){
        $lname = $_POST[lname]; //If lname was entered
    }
    else{
        if ($errormsg){ //If there is already an error, add next error
            $errormsg = $errormsg . ", last name";
            }
        else{
             $errormsg = "Please enter last name";
        }    
    }
    if ($_POST[email]){
        $email = $_POST[email]; //If email was entered
    }
    else{
        if ($errormsg){ //If there is already an error, add next error
            $errormsg = $errormsg . " & email";
        }else{
            $errormsg = "Please enter email";
        }
    }   
}
if ($errormsg){ //If any errors display them
    echo "<div class="box red">$errormsg</div>";
}
//If all fields present
if ($fname && $lname && $email){
    //Do something
    echo "<div class="box green">Form completed!</div>";
}
?>

---

一些$ _POST变量缺少单引号，这可能是导致错误的原因。 但是，一般来说，我已经提出了其他代码建议。 我将您的代码重构为更具扩展性，并采用以下增强功能遵循更好的实践：

表单值会记住它们以前的值，并且不会在每个帖子中被删除。

删除了“已提交”字段，并替换为if (!empty($_POST)) {}以确保发布表单。

将错误消息移入数组中。 这对我来说更具可维护性和可读性（想象有15个以上的字段可供测试）。

添加了validate（）函数以在您的验证测试中运行。

删除了变量赋值（$ fname = $ _POST ['fname']），因为除了可以直接访问它们的验证之外，它们没有被使用。

移动主if语句中的所有测试。

希望这可以帮助！

<form action="process.php" method="post">
First Name: <input type="text" name="fname" value="<?php echo isset($_POST['fname']) ? $_POST['fname'] : ''?>"><br>
Last Name: <input type="text" name="lname" value="<?php echo isset($_POST['lname']) ? $_POST['lname'] : ''?>"><br>
E-mail: <input type="text" name="email" value="<?php echo isset($_POST['email']) ? $_POST['email'] : ''?>"><br>
<input type="submit">
</form>

<?php
//If form was submitted

if (!empty($_POST)) {

    $errors = array();

    if (empty($_POST['fname'])){
       $errors[] = 'First name must be entered.';
    }

    if (empty($_POST['lname'])){
        $errors[] = 'Last name must be entered.';
    }

    if (empty($_POST['email'])){
       $errors[] = 'Email address must be entered.';
    }


    if ($errors){ //If any errors display them
        $error_msg = implode('<br>',$errors);
        echo "<div class="box red">$error_msg</div>";
    } 
    //If all fields present
    elseif (validate()){
        //Do something
        echo "<div class="box green">Form completed and validated!</div>";
    }
}

function validate() {
    /*you can run all your validation methods here, such as check for length, regexp email verification, etc.*/
    $validated = false;
    if ($_POST['fname'] && $_POST['lname'] && $_POST['email']) { 
        $validated = true;
    }
    return $validated;
}
?>

---

你忘了在post数组上添加" $_POST[lname]变为$_POST['lname'];错误原因，将字符串传递给你的$_POST[];

if ($_POST["fname"]){
        $fname = $_POST[fname]; //If fname was entered
    }
    else{
        $errormsg = "Please enter first name";
    }
    if ($_POST["lname"]){
        $lname = $_POST[lname]; //If lname was entered
    }
    else{
        if ($errormsg){ //If there is already an error, add next error
            $errormsg = $errormsg . ", last name";
            }
        else{
             $errormsg = "Please enter last name";
        }    
    }
    if ($_POST["email"]){
        $email = $_POST["email"]; //If email was entered
    }

---

对于$ _POST变量，使用$ _POST ['您的变量名称']语法

我更正了你的代码，如下所示：

<form action="test.php" method="post">
First Name: <input type="text" name="fname"><br>
Last Name: <input type="text" name="lname"><br>
E-mail: <input type="text" name="email"><br>
<input type="hidden" name="submitted" value="1">
<input type="submit">
</form>

<?php
//If form was submitted

if ($_POST['submitted']==1) {
$errormsg = ""; //Initialize errors
    if ($_POST['fname']){
        $fname = $_POST['fname']; //If fname was entered
    }
    else{
        $errormsg = "Please enter first name";
    }
    if ($_POST['lname']){
        $lname = $_POST['lname']; //If lname was entered
    }
    else{
        if ($errormsg){ //If there is already an error, add next error
            $errormsg = $errormsg . ", last name";
            }
        else{
             $errormsg = "Please enter last name";
        }    
    }
    if ($_POST['email']){
        $email = $_POST['email']; //If email was entered
    }
    else{
        if ($errormsg){ //If there is already an error, add next error
            $errormsg = $errormsg . " & email";
        }else{
            $errormsg = "Please enter email";
        }
    }   
}
if ($errormsg){ //If any errors display them
    echo "<div class="box red">$errormsg</div>";
}
//If all fields present
if ($fname && $lname && $email){
    //Do something
    echo "<div class="box green">Form completed!</div>";
}
?>

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