如何使用PHP在视图页面中显示错误消息
[英]How to display error message in view page using PHP
问题描述
I need to display the error message using php.I am explaining my code below. 
我需要使用php显示错误消息。我在下面解释我的代码。
addcomplain.php:
<div style="color:#F00; text-align:center;"><?php echo $error?></div>
<form name="billdata" id="billdata" enctype="multipart/form-data" method="POST" onSubmit="javascript:return checkForm();" action="complain.php">
</form>
Suppose i have a form like above and when i submit the below file is called. 假设我有一个像上面的表格，当我提交下面的文件时被调用。
complain.php:
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0)
{
$error = "Email Id already exists!";
}
when the above error will come,i need it should display just above the form.In my case i am not getting anything.Please help me to resolve this issue. 当出现上述错误时，我需要将其显示在表格上方。就我而言，我什么也没收到。请帮助我解决此问题。
6 个解决方案
解决方案1
1 2016-01-27 10:41:13
Try this 尝试这个
addcomplain.php: addcomplain.php：
<?php
if(isset($_SESSION["error"])){
echo '<div style="color:#F00; text-align:center;">'. $_SESSION["error"] .'</div>';;
unset($_SESSION["error"]);
} ?>
complain.php: 抱怨.php：
session_start();
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0)
{
$_SESSION["error"] = "Email Id already exists!";
}
解决方案2
1 2016-01-27 10:44:50
You don't need a session. 您不需要会话。
Merge your code into 1 file. 将您的代码合并为1个文件。 Show only $error if he is not null , like so: 如果他不为null ，则仅显示$error ，如下所示：
<?php
$error = null;
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0) {
$error = "Email Id already exists!";
}
}
?>
<div style="color:#F00; text-align:center;"><?= (!is_null($error) ? $error : ''); ?></div>
<form name="billdata" id="billdata" enctype="multipart/form-data" method="POST" onSubmit="javascript:return checkForm();" action="complain.php">
</form>
</div>
解决方案3
0 2016-01-27 10:38:53
Try like this : 尝试这样：
complain.php: 抱怨.php：
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0)
{
$_SESSION["error"] = "Email Id already exists!";
}
In addcomplain.php : 在addcomplain.php中：
$error = $_SESSION["error"];
unset($_SESSION["error"]);
<div style="color:#F00; text-align:center;"><?php echo $error?></div>
<form name="billdata" id="billdata" enctype="multipart/form-data" method="POST" onSubmit="javascript:return checkForm();" action="complain.php">
</form>
解决方案4
0 2016-01-27 10:40:34
You can write couple of functions to make it easier: 您可以编写一些函数来简化操作：
function setMessage($message){
$_SESSION['msg'] = $message;
}
function showMessage(){
echo $_SESSION['msg'];
unset($_SESSION['msg']);
}
complain.php: 抱怨.php：
if(mysqli_num_rows($selres ) > 0)
{
$error = "Email Id already exists!";
setMessage($error);
}
addcomplain.php: addcomplain.php：
<div style="color:#F00; text-align:center;"><?php echo showMessage(); ?></div>
Note: make sure you have started the session, using session_start() in the top of the page. 注意：请使用页面顶部的session_start()确保已启动会话。
解决方案5
0 2016-01-27 10:42:07
Use Session object for this. 为此使用Session对象。
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0)
{
$_SESSION['error'] = "Email Id already exists!";
}
The display like this. 这样的显示。
<?php
$error = "";
if(isset($_SESSION['error']))
{
$error = $_SESSION['error'];
unset($_SESSION['error']);
}
?>
<div style="color:#F00; text-align:center;">
<?php echo $error; ?>
</div>
<form name="billdata" id="billdata" enctype="multipart/form-data" method="POST" onSubmit="javascript:return checkForm();" action="complain.php">
</form>
解决方案6
0 2016-01-27 10:49:10
complain.php 抱怨.php
<?php
$sql="SELECT * FROM medilink_complain WHERE email='".$email."'";
$selres = mysqli_query($con,$sql);
if(mysqli_num_rows($selres ) > 0)
{
$error = "Email Id already exists!";
} else {
$error = '';
}
include 'addcomplain.php'; // <----
?>
addcomplain.php addcomplain.php
<html>
<body>
<div style="color:#F00; text-align:center;"><?php echo $error?></div>
<form name="billdata" id="billdata" enctype="multipart/form-data" method="POST" onSubmit="javascript:return checkForm();" action="complain.php">
<input value="test" />
</form>
</body>
</html>
...works for me! ...为我工作！ No session variable needed. 无需会话变量。
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