Php 提交表单后显示错误消息
我有一份登记表，其中我对电子邮件id和状态进行了检查，这样一个人就不能用同一封电子邮件再次注册。表单和脚本都在一个页面上，页面采用.php格式。问题是，虽然检查工作正常，但我无法在电子邮件框前显示错误消息。如果有人能帮助我，我将不胜感激Php 提交表单后显示错误消息,php,html,mysql,Php,Html,Mysql,我有一份登记表，其中我对电子邮件id和状态进行了检查，这样一个人就不能用同一封电子邮件再次注册。表单和脚本都在一个页面上，页面采用.php格式。问题是，虽然检查工作正常，但我无法在电子邮件框前显示错误消息。如果有人能帮助我，我将不胜感激 <form role="form" action="" autocomplete="off" method="POST"> <div class="input-group"> <span class="in
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<span><?php echo $errormsg;?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$name = mysqli_real_escape_string($con, $_POST['name']);
$email = mysqli_real_escape_string($con, $_POST['email']);
$password = mysqli_real_escape_string($con, $_POST['password']);
$phoneno = mysqli_real_escape_string($con, $_POST['phoneno']);
$status = mysqli_real_escape_string($con, $_POST['status']);
$sql = "SELECT * FROM register WHERE email='".$email."' AND status='1'";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0)
{
$errormsg="email already exist";
}
else
{
$sql="INSERT INTO register (name,email,password,phoneno,status) VALUES ('$name','$email','$password','$phoneno','1')";
if (!mysqli_query($con,$sql))
{
die('Error: ' . mysqli_error($con));
}
exit;
mysqli_close($con);
}
?>
注册
如果所有代码都在一个文件中，那么您将PHP代码移到html代码之上，为什么在执行PHP代码之前，错误没有显示html正在首先呈现？i、 e:
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$name = mysqli_real_escape_string($con, $_POST['name']);
$email = mysqli_real_escape_string($con, $_POST['email']);
$password = mysqli_real_escape_string($con, $_POST['password']);
$phoneno = mysqli_real_escape_string($con, $_POST['phoneno']);
$status = mysqli_real_escape_string($con, $_POST['status']);
$sql = "SELECT * FROM register WHERE email='".$email."' AND status='1'";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0)
{
$errormsg="email already exist";
}
else{
$sql="INSERT INTO register (name,email,password,phoneno,status) VALUES ('$name','$email','$password','$phoneno','1')";
if (!mysqli_query($con,$sql))
{
die('Error: ' . mysqli_error($con));
}
exit;
mysqli_close($con);
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg;?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
如果所有代码都在一个文件中，那么您将PHP代码移到html代码之上，为什么在执行PHP代码之前不显示html正在呈现？i、 e:
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$name = mysqli_real_escape_string($con, $_POST['name']);
$email = mysqli_real_escape_string($con, $_POST['email']);
$password = mysqli_real_escape_string($con, $_POST['password']);
$phoneno = mysqli_real_escape_string($con, $_POST['phoneno']);
$status = mysqli_real_escape_string($con, $_POST['status']);
$sql = "SELECT * FROM register WHERE email='".$email."' AND status='1'";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0)
{
$errormsg="email already exist";
}
else{
$sql="INSERT INTO register (name,email,password,phoneno,status) VALUES ('$name','$email','$password','$phoneno','1')";
if (!mysqli_query($con,$sql))
{
die('Error: ' . mysqli_error($con));
}
exit;
mysqli_close($con);
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg;?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
如果所有代码都在一个文件中，那么您将PHP代码移到html代码之上，为什么在执行PHP代码之前不显示html正在呈现？i、 e:
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$name = mysqli_real_escape_string($con, $_POST['name']);
$email = mysqli_real_escape_string($con, $_POST['email']);
$password = mysqli_real_escape_string($con, $_POST['password']);
$phoneno = mysqli_real_escape_string($con, $_POST['phoneno']);
$status = mysqli_real_escape_string($con, $_POST['status']);
$sql = "SELECT * FROM register WHERE email='".$email."' AND status='1'";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0)
{
$errormsg="email already exist";
}
else{
$sql="INSERT INTO register (name,email,password,phoneno,status) VALUES ('$name','$email','$password','$phoneno','1')";
if (!mysqli_query($con,$sql))
{
die('Error: ' . mysqli_error($con));
}
exit;
mysqli_close($con);
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg;?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
如果所有代码都在一个文件中，那么您将PHP代码移到html代码之上，为什么在执行PHP代码之前不显示html正在呈现？i、 e:
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// escape variables for security
$name = mysqli_real_escape_string($con, $_POST['name']);
$email = mysqli_real_escape_string($con, $_POST['email']);
$password = mysqli_real_escape_string($con, $_POST['password']);
$phoneno = mysqli_real_escape_string($con, $_POST['phoneno']);
$status = mysqli_real_escape_string($con, $_POST['status']);
$sql = "SELECT * FROM register WHERE email='".$email."' AND status='1'";
$result = mysqli_query($con, $sql);
if (mysqli_num_rows($result) > 0)
{
$errormsg="email already exist";
}
else{
$sql="INSERT INTO register (name,email,password,phoneno,status) VALUES ('$name','$email','$password','$phoneno','1')";
if (!mysqli_query($con,$sql))
{
die('Error: ' . mysqli_error($con));
}
exit;
mysqli_close($con);
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg;?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
您应该设置/初始化上面的错误容器，并首先在html上面进行检查
别忘了使用事先准备好的语句
<?php
$errormsg = '';
$con = mysqli_connect("localhost","root","","db_name");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
$phoneno = $_POST['phoneno'];
$status = $_POST['status'];
$sql = "SELECT * FROM register WHERE email = ? AND status = '1' ";
$check = $con->prepare($sql);
$check->bind_param('s', $email);
$check->execute();
if ($check->num_rows > 0) {
$errormsg = "email already exist";
}
else{
$sql = "INSERT INTO register (name,email,password,phoneno,status) VALUES (?, ?, ?, ?, '1')";
$insert = $con->prepare($sql);
$insert->bind_param('ssss', $name, $email, $password, $phoneno);
$insert->execute();
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg; ?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
您应该设置/初始化上面的错误容器，并首先在html上面进行检查
别忘了使用事先准备好的语句
<?php
$errormsg = '';
$con = mysqli_connect("localhost","root","","db_name");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
$phoneno = $_POST['phoneno'];
$status = $_POST['status'];
$sql = "SELECT * FROM register WHERE email = ? AND status = '1' ";
$check = $con->prepare($sql);
$check->bind_param('s', $email);
$check->execute();
if ($check->num_rows > 0) {
$errormsg = "email already exist";
}
else{
$sql = "INSERT INTO register (name,email,password,phoneno,status) VALUES (?, ?, ?, ?, '1')";
$insert = $con->prepare($sql);
$insert->bind_param('ssss', $name, $email, $password, $phoneno);
$insert->execute();
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg; ?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
您应该设置/初始化上面的错误容器，并首先在html上面进行检查
别忘了使用事先准备好的语句
<?php
$errormsg = '';
$con = mysqli_connect("localhost","root","","db_name");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
$phoneno = $_POST['phoneno'];
$status = $_POST['status'];
$sql = "SELECT * FROM register WHERE email = ? AND status = '1' ";
$check = $con->prepare($sql);
$check->bind_param('s', $email);
$check->execute();
if ($check->num_rows > 0) {
$errormsg = "email already exist";
}
else{
$sql = "INSERT INTO register (name,email,password,phoneno,status) VALUES (?, ?, ?, ?, '1')";
$insert = $con->prepare($sql);
$insert->bind_param('ssss', $name, $email, $password, $phoneno);
$insert->execute();
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg; ?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
您应该设置/初始化上面的错误容器，并首先在html上面进行检查
别忘了使用事先准备好的语句
<?php
$errormsg = '';
$con = mysqli_connect("localhost","root","","db_name");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];
$phoneno = $_POST['phoneno'];
$status = $_POST['status'];
$sql = "SELECT * FROM register WHERE email = ? AND status = '1' ";
$check = $con->prepare($sql);
$check->bind_param('s', $email);
$check->execute();
if ($check->num_rows > 0) {
$errormsg = "email already exist";
}
else{
$sql = "INSERT INTO register (name,email,password,phoneno,status) VALUES (?, ?, ?, ?, '1')";
$insert = $con->prepare($sql);
$insert->bind_param('ssss', $name, $email, $password, $phoneno);
$insert->execute();
}
?>
<form role="form" action="" autocomplete="off" method="POST">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="name" class="form-control" name="name" placeholder="Company Name" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="email" class="form-control" name="email" placeholder="email address" required>
</div>
<?php echo $errormsg; ?></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" class="form-control" name="password" placeholder="Password" required>
</div>
<span class="help-block"></span>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="tel" id="tel" class="form-control" name="phoneno" pattern="\d{10}" placeholder="Please enter a ten digit phone number" required />
</div>
<span class="help-block"></span>
<input class="form-control" value="" type="hidden" name="status">
<button class="btn btn-lg btn-primary btn-block" name="submit" type="submit">Sign Up</button>
</form>
@Arif\u suhail\u 123它仍然没有显示error@Arif_suhail_123它仍然没有显示error@Arif_suhail_123它仍然没有显示error@Arif_suhail_123它仍然没有显示错误你错过了你错过了你错过了你错过了你错过了你错过了我想再问一件事，第一次加载页面时，也会显示错误消息。请告诉我如何更正这些代码只需要在POST的情况下执行，所以将整个PHP代码放入if（$_POST）{--这里的代码--}我想再问一件事，当页面第一次加载时，也会显示错误消息。请告诉我如何更正这些代码只需要在POST的情况下执行，所以将整个PHP代码放入if（$_POST）{--这里的代码--}我想再问一件事，当页面第一次加载时，也会显示错误消息。请告诉我如何更正这些代码只需要在POST的情况下执行，所以将整个PHP代码放入if（$_POST）{--这里的代码--}我想再问一件事，当页面第一次加载时，也会显示错误消息。请告诉我如何更正这些代码只需要在POST的情况下执行，所以请将整个PHP代码放入if（$_POST）{--这里的代码--}