PHP简单表单验证 - 需要帮助

Question

好吧,我想要实现的是一个非常简单的表单验证,如下所示.

1. 名称:[必填,最小长度:2,最大长度:255]
2. 电子邮件:[必填,最小长度:3,最大长度:255,有效的电子邮件格式]
3. 出生日期:[可选,格式:dd/mm/yyyy]

但是,一旦我单击提交(如果字段为空或填充),我将在空白页面上显示所有回显的错误.

"名称必须至少为2个字符名称为requiredemail必须至少3个字符无效,电子邮件不能留空"

我的代码到目前为止:

的index.php

<form method="post" action="confirm.php">
Name:<input type="text" name="name" />
email:<input type="text" name="email" />
DOB:<input type="date" name="dob" />
<input type="submit" value="submit" />
</form>

和

confirm.php

<?php

$name = $_POST['$name'];
$email = $_POST['$email'];
$dob = $_POST['$dob'];

$namelen = strlen($email);
$emaillen = strlen($email);
$max = 255;
$minname = 2;
$minemail = 3;

if($namelen<$minname){
    echo"name must be at least 2 characters";
}
elseif($namelen>$max){
    echo"name must be less than 255 characters";
}

if(empty($name)){
    echo"name is required";
}
else{
    continue;
}

if($emaillen<$minemail){
    echo"email must be at least 3 characters";
}
elseif($emaillen>$max){
    echo"email must be less than 255 characters";
}

if(filter_var($email, FILTER_VALIDATE_EMAIL)){
    continue;
}
else{
    echo"invalid email";
}

if(empty($email)){
    echo"email cannot be left empty";
}
else{
    continue;
}

?>

非常感谢帮助,谢谢.

Answer 1

alert是一个JavaScript函数,而不是PHP函数.如果要在PHP中使用警报功能,则需要创建一个自定义的函数,如下所示:

function alert($alertMessage){
    //Do something with $alertMessage
}

错误:

致命错误:调用未定义的函数alert()

基本上意味着PHP无法找到一个名为alert的函数.