我创建了一个PHP表单,以接受4个文本字段的名称,电子邮件,用户名和密码,并为这些设置了验证。我的代码当前可以正确验证,并且无论代码是否通过验证,都会显示消息。但是,我希望它在提交时保留正确验证的字段,而那些未通过验证的字段则为空,并显示一条错误消息,详细说明原因。
到目前为止,我有以下代码,主要是form.php:
<?php
$self = htmlentities($_SERVER['PHP_SELF']);
?>
<form action="<?php echo $self; ?>" method="post">
<fieldset>
<p>You must fill in every field</p>
<legend>Personal details</legend>
<?php
include 'personaldetails.php';
include 'logindetails.php';
?>
<div>
<input type="submit" name="" value="Register" />
</div>
</fieldset>
</form>
<?php
$firstname = validate_fname();
$emailad = validate_email();
$username = validate_username();
$pword = validate_pw();
?>
我的functions.php代码如下:
<?php
function validate_fname() {
if (!empty($_POST['fname'])) {
$form_is_submitted = true;
$trimmed = trim($_POST['fname']);
if (strlen($trimmed)<=150 && preg_match('/\\s/', $trimmed)) {
$fname = htmlentities($_POST['fname']);
echo "<p>You entered full name: $fname</p>";
} else {
echo "<p>Full name must be no more than 150 characters and must contain one space.</p>";
} }
}
function validate_email() {
if (!empty($_POST['email'])) {
$form_is_submitted = true;
$trimmed = trim($_POST['email']);
if (filter_var($trimmed, FILTER_VALIDATE_EMAIL)) {
$clean['email'] = $_POST['email'];
$email = htmlentities($_POST['email']);
echo "<p>You entered email: $email</p>";
} else {
echo "<p>Incorrect email entered!</p>";
} }
}
function validate_username() {
if (!empty($_POST['uname'])) {
$form_is_submitted = true;
$trimmed = trim($_POST['uname']);
if (strlen($trimmed)>=5 && strlen($trimmed) <=10) {
$uname = htmlentities($_POST['uname']);
echo "<p>You entered username: $uname</p>";
} else {
echo "<p>Username must be of length 5-10 characters!</p>";
} }
}
function validate_pw() {
if (!empty($_POST['pw'])) {
$form_is_submitted = true;
$trimmed = trim($_POST['pw']);
if (strlen($trimmed)>=8 && strlen($trimmed) <=10) {
$pword = htmlentities($_POST['pw']);
echo "<p>You entered password: $pword</p>";
} else {
echo "<p>Password must be of length 8-10 characters!</p>";
} }
}
?>
我如何确保按下提交按钮时,它将保留有效输入,并清空无效的返回错误消息的输入。
最好我还希望初始if(!empty)有一个替代else条件。我最初有这个,但是发现它将以错误信息开始表格。
最后,在通过此表单注册后,如何将有效信息记录到外部文件中以用于检查登录详细信息?
任何帮助是极大的赞赏。
尝试对错误使用单独的变量,而不将错误消息输出到该input
字段。
您可以global
为此使用变量,但是我不喜欢它们。
login.php
<?php
$firstname = '';
$password = '';
$username = '';
$emailadd = '';
$response = '';
include_once('loginprocess.php');
include_once('includes/header.php);
//Header stuff
?>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"], ENT_QUOTES, "utf-8");?>" method="post">
<fieldset>
<p>Please enter your username and password</p>
<legend>Login</legend>
<div>
<label for="fullname">Full Name</label>
<input type="text" name="fname" id="fullname" value="<?php echo $firstname ?>" />
</div>
<div>
<label for="emailad">Email address</label>
<input type="text" name="email" id="emailad" value="<?php echo $emailadd; ?>"/>
</div>
<div>
<label for="username">Username (between 5-10 characters)</label>
<input type="text" name="uname" id="username" value='<?php echo $username; ?>' />
</div>
<div>
<label for="password">Password (between 8-10 characters)</label>
<input type="text" name="pw" id="password" value="<?php echo $password; ?>" />
</div>
<div>
<input type="submit" name="" value="Submit" />
</div>
</fieldset>
</form>
<?php
//Output the $reponse variable, if your validation functions run, then it
// will contain a string, if not, then it will be empty.
if($response != ''){
print $response;
}
?>
//Footer stuff
loginprocess.php
//No need for header stuff, because it's loaded with login.php
if($_SERVER['REQUEST_METHOD'] == 'POST'){//Will only run if a post request was made.
//Here we concatenate the return values of your validation functions.
$response .= validate_fname();
$response .= validate_email();
$response .= validate_username();
$response .= validate_pw();
}
//...or footer stuff.
functions.php
function validate_fname() {
//Note the use of global...
global $firstname;
if (!empty($_POST['fname'])) {
$form_is_submitted = true;
$trimmed = trim($_POST['fname']);
if(strlen($trimmed)<=150 && preg_match('/\\s/', $trimmed)){
$fname = htmlentities($_POST['fname']);
//..and the setting of the global.
$firstname = $fname;
//Change all your 'echo' to 'return' in other functions.
return"<p>You entered full name: $fname</p>";
} else {
return "<p>Full name must be no more than 150 characters and must contain one space.</p>";
}
}
}
我不建议将include用于诸如表格之类的小东西,我发现它会很快使事情变得一团糟。将所有“显示”代码保存在一个文件中,并且仅在范围发生更改时才将include用于函数(如您所拥有的)和拆分文件。即,您的functions.php文件目前正在处理验证,但是您稍后可能需要创建一个新的include,以处理实际的登录或注册过程。
查看http://www.php.net/manual/en/language.operators.string.php以了解有关串联的信息。
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