Php 如何限制输入字段中的空白？ .错误{ 颜色：红色； } .按钮{ 背景色：#4CAF50； 边界：无； 颜色：白色； 填充：10px 25px； 文本对齐：居中； 文字装饰：无； 显示：内联块； 字体大小：16px； 利润：4倍2倍； 光标：指针； } .1分部{ 背景色：#F2F2； 利润上限：-19px； 边缘底部：-25px； 左边距：-19px； } .复制{ 边界半径：4px； 填充：6px 20px； 边缘样式：脊； } .copy1{ 边界半径：4px； 填充：6px28px； 边缘样式：脊； } .copy2{ 边界半径：4px； 填充物：4px2px； } “style=”宽度：180px；高度：100px；填充：10px；"/> 已注册
嗨，伙计们，我只有一个小问题请帮帮我，我有一张登记表，上面有各种输入， 我的问题是，如果我给name输入字段留出空白，然后给submit，那么它应该是空的 显示不允许有空格的任何错误Php 如何限制输入字段中的空白？ .错误{ 颜色：红色； } .按钮{ 背景色：#4CAF50； 边界：无； 颜色：白色； 填充：10px 25px； 文本对齐：居中； 文字装饰：无； 显示：内联块； 字体大小：16px； 利润：4倍2倍； 光标：指针； } .1分部{ 背景色：#F2F2； 利润上限：-19px； 边缘底部：-25px； 左边距：-19px； } .复制{ 边界半径：4px； 填充：6px 20px； 边缘样式：脊； } .copy1{ 边界半径：4px； 填充：6px28px； 边缘样式：脊； } .copy2{ 边界半径：4px； 填充物：4px2px； } “style=”宽度：180px；高度：100px；填充：10px；"/> 已注册,php,html,mysqli,Php,Html,Mysqli,嗨，伙计们，我只有一个小问题请帮帮我，我有一张登记表，上面有各种输入， 我的问题是，如果我给name输入字段留出空白，然后给submit，那么它应该是空的 显示不允许有空格的任何错误 i、 例如，它们只能是字母，但不能接受任何数字、特殊字符和其他东西。 有谁能帮我一下吗？如果（！preg_match（“/^[a-zA-Z]*$/”，$name））{必须是这样的： <!DOCTYPE HTML> <html> <head> <style> .er
i、 例如，它们只能是字母，但不能接受任何数字、特殊字符和其他东西。 有谁能帮我一下吗？如果（！preg_match（“/^[a-zA-Z]*$/”，$name））{必须是这样的：
<!DOCTYPE HTML>
<html>
<head>
<style>
.error {
color:red;
}
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 25px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.div1 {
background-color: #f2f2f2;
margin-top: -19px;
margin-bottom: -25px;
margin-left: -19px;
}
.copy {
border-radius: 4px;
padding: 6px 20px;
border-style: ridge;
}
.copy1{
border-radius: 4px;
padding: 6px 28px;
border-style: ridge;
}
.copy2{
border-radius: 4px;
padding: 4px 2px;
}
</style>
</head>
<body>
<?php
session_start();
if (isset($_SESSION['id'])){
header('location:welcome.php');
}
?>
<?php
// define variables and set to empty values
include_once 'connect.php';
$nameErr = $emailErr = $usernameErr = $passwordErr = $DateOfBirthErr = $departmentErr = $ageErr = $fileToUploadErr = $fileToUploadErrr = $fileToUploadErrrr = $fileToUploadErrrrr = $fileToUploadErrrrrr = "" ;
$name = $email = $username = $password = $DateOfBirth = $department = $age = $fileToUpload = $filename = $file = "";
if (isset($_POST['submit'])) {
if (empty($_POST["name"])) {
$nameErr = "Name is required";
} else {
$name = test_input($_POST["name"]);
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
$nameErr = "Only letters";
}
}
if (empty($_POST["email"])) {
$emailErr = "Email is required";
} else {
$email = test_input($_POST["email"]);
// check if e-mail address is well-formed
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
$emailErr = "Invalid email format";
}
}
if (empty($_POST["username"])) {
$usernameErr = "Username is required";
} else {
$username = test_input($_POST["username"]);
// check if name only contains letters and whitespace
if (!preg_match("/^[a-zA-Z ]*$/",$username)) {
$usernameErr = "Only letters";
}
}
if (empty($_POST["password"])) {
$passwordErr = "Password is required";
} else {
$password = test_input($_POST["password"]);
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
// check weather password is alphanumeric
if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!@#$%]{6,}$/', $password))
{
$passwordErr = "Password must be alphanumeric and atleast 6 characters long!";
}
}
if (empty($_POST["Date_of_birth"])) {
$DateOfBirthErr = "Date Of Birth is required";
} else {
$DateOfBirth = test_input($_POST["Date_of_birth"]);
}
if (empty($_POST["department"])) {
$departmentErr = "Department is required";
} else {
$department = test_input($_POST["department"]);
}
if (empty($_POST["age"])) {
$ageErr = "Age is required";
} else {
$age = test_input($_POST["age"]);
}
//UPLOAD FILE
$uploaddir = 'upload/';
$uploadfile = $uploaddir . basename($_FILES['fileToUpload']['name']);
$imageFileType = pathinfo($uploadfile,PATHINFO_EXTENSION);
if($_FILES['fileToUpload']['name'] != '')
{
// Check the image is actaully image or not
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check == false)
{
$fileToUploadErrrrr = "File is not an image.";
}
// Check if file already exists
if (file_exists($uploadfile)) {
$fileToUploadErrrrrr = "Sorry, file already exists.";
}
if($imageFileType != "jpg" && $imageFileType != "png" )
{
$fileToUploadErr = "Sorry, only JPG,PNG files are allowed.";
}
elseif($_FILES['fileToUpload']['size'] > 500000)
{
$fileToUploadErrrr = "Sorry, your file is too large.";
}
else
{
/* if($filename != '')
{
$target = "upload/".$filename;
unlink($target);
}*/
$uploaded = move_uploaded_file($_FILES['fileToUpload']['tmp_name'], $uploadfile);
if ($uploaded) {
$file = $_FILES['fileToUpload']['name'];
}
else{
$file = $filename;
}
}
}
elseif($_FILES['fileToUpload']['name'] = " ")
{
$fileToUploadErrr = "Please Select an image!";
}
else {
$file = $filename;
}
if($nameErr == "" && $emailErr == "" && $usernameErr == "" && $passwordErr == "" && $fileToUploadErr == "" && $fileToUploadErrr == "" && $fileToUploadErrrr == "" && $fileToUploadErrrrr == "" && $fileToUploadErrrrrr == "" )
{
$check="SELECT * FROM users WHERE username = '$_POST[username]'";
$rs = mysqli_query($mysqli,$check);
$da = mysqli_fetch_array($rs, MYSQLI_NUM);
if($da[0] > 0) {
echo "Username Already in Exists<br/>";
}
else
{
$sql = "INSERT INTO users(`userid`,`username`, `password`, `email` , `name` , `Date_of_birth` , `department` ,`age` , `filename` )
VALUES ('','".$username."', '".$hashed_password."', '".$email."' , '".$name."' , '".$DateOfBirth."' , '".$department."' , '".$age."' , '".$file."')";
if (mysqli_query($mysqli, $sql)) {
echo "Registered successfully";
} else {
echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
}
mysqli_close($mysqli);
}
}
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
<div style="padding-left: 250px" class="div1">
<h2 style="color:#009999">Registration Form :</h2>
<p><span class="error">All fields are required </span></p>
<form action="" method="post" enctype="multipart/form-data">
<span style="color:#0099ff">Name: </span>
<input type="text" name="name" class= "copy" style="margin-left: 52px" value ="<?php
if (isset($name))
echo $name;
?>">
<span class="error"> <?php echo $nameErr;?></span>
<br><br>
<span style="color:#0099ff"> E-mail: </span>
<input type="text" name="email" class= "copy" style="margin-left: 48px" value ="<?php
if (isset($email))
echo $email;
?>">
<span class="error"><?php echo $emailErr;?></span>
<br><br>
<span style="color:#0099ff"> Username: </span>
<input type="text" name="username" class= "copy" style="margin-left:26px" value ="<?php
if (isset($username))
echo $username;
?>">
<span class="error"> <?php echo $usernameErr;?></span>
<br><br>
<span style="color:#0099ff"> Password: </span>
<input type="password" name="password" class= "copy" style="margin-left:30px">
<span class="error"> <?php echo $passwordErr;?></span>
<br><br>
<span style="color:#0099ff"> Date Of Birth : </span>
<input type="date" class= "copy1" name="Date_of_birth" value ="<?php
if (isset($DateOfBirth))
echo $DateOfBirth;
?>">
<span class="error"> <?php echo $DateOfBirthErr;?></span>
<br><br>
<span style="color:#0099ff"> Age : </span>
<input type="number" name="age" class= "copy" style="margin-left:62px" value ="<?php
if (isset($age))
echo $age;
?>">
<span class="error"> <?php echo $ageErr;?></span>
<br><br>
<span style="color:#0099ff"> Department : </span>
<select name="department" class= "copy2" style="margin-left:14px" value ="<?php
if (isset($department))
echo $department;
?>">
<option value="EE">Electrical & Electronics</option>
<option value="EC">Electronics & Communication</option>
<option value="ME">Mechanical</option>
<option value="CS">Computer Science</option>
<option value="CV">Civil</option>
<option value="IS">Information Science</option>
</select>
<span class="error"> <?php echo $departmentErr;?></span>
<br><br>
<span style="color:#0099ff"> Select image : </span>
<input type="file" name="fileToUpload">
<?php if($filename !=''){ ?> <img src="<?php echo "upload/" .$filename ?>" style="width:180px;height:100px;padding:10px;"/> <?php } ?>
<span class="error"><br> <?php echo $fileToUploadErr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrrr; ?></span>
<span class="error"><br> <?php echo $fileToUploadErrrrrr; ?></span>
<input type="submit" class="button" name="submit" value="Register">
<p style="color:black">Already Registered? <a href="login.php">Login</a>.</p>
</form>
</div>
</body>
</html>
if (!preg_match("/^[a-zA-Z]*$/",$name)) {