Question

嗨大家对表单有什么问题....当发布到网站时我得到这个错误（注意：未定义索引:)，它的工作原理只是错误高于实际形式，单挑出下面表格的顶部它说错误在哪里......

<?php
$action=$_REQUEST['action'];
if ($action=="")    /* display the contact form */
{
?>



<?php
$action=$_REQUEST['action'];
if ($action=="")    /* display the contact form */
{
?>
<form  action="" method="POST" enctype="multipart/form-data">
<input type="hidden" name="action" value="submit">
Your name:<br>
<input name="name" type="text" value="" size="30"/><br>
Your email:<br>
<input name="email" type="text" value="" size="30"/><br>
Your message:<br>
<textarea name="message" rows="7" cols="30"></textarea><br>
<input type="submit" value="Send email"/>
</form>
<?php
} 
else                /* send the submitted data */
{
$name=$_REQUEST['name'];
$email=$_REQUEST['email'];
$message=$_REQUEST['message'];
if (($name=="")||($email=="")||($message==""))
    {
    echo "All fields are required, please fill <a href=\"\">the form</a> again.";
    }
else{        
    $from="From: $name<$email>\r\nReturn-path: $email";
    $subject="Message sent using your contact form";
    mail("myemail@email.com", $subject, $message, $from);
    echo "Email sent!";
    }
}  
?>

Answer 1

<?
  if(isset($_REQUEST['action']) && $_REQUEST['action']!="")
 {
   //do stuff
 }
else
{
   ?>
   <!-- show form --->

   <?php
}
?>

Answer 2

通知出现原因未找到值或未初始化变量。所以尝试初始化变量或使用检查值

使用empty()或isset()作为检查值喜欢： -

$action=(isset($_REQUEST['action']) ? $_REQUEST['action'] :'');

if(!empty($action))
 // do your stuff

Answer 3

检查$ _REQUEST中是否设置了索引action。并使用empty()检查其设置是否为空。

Answer 4

您正在以错误的方式检查表单提交

$action=$_REQUEST['action'];
if ($action=="")    /* display the contact form */

假设，控件来自的按钮名称为name="submit_form"，方法为POST

使用：

if(isset($_POST["submit_form"])) //this will check if "submit_form" was pressed or not
{
 //show form submission action
}
else
{
 //don't show show form submission action
}

Answer 5

用这个改变你的代码...... 你应该在php中使用空函数来检查variabel是否为空。因为$ _REQUEST [＆＃39; action＆＃39;]中的索引操作在第一个代码运行时永远不存在。

<?php
$action = (!empty($_REQUEST['action'])) ? $_REQUEST['action'] : "";
if ($action==""):  /* display the contact form */
?>



<?php
$action= (!empty($_REQUEST['action'])) ? $_REQUEST['action'] : "";
if ($action==""):    /* display the contact form */
?>
<form  action="" method="POST" enctype="multipart/form-data">
<input type="hidden" name="action" value="submit">
Your name:<br>
<input name="name" type="text" value="" size="30"/><br>
Your email:<br>
<input name="email" type="text" value="" size="30"/><br>
Your message:<br>
<textarea name="message" rows="7" cols="30"></textarea><br>
<input type="submit" value="Send email"/>
</form>
<?php
endif;
else:                /* send the submitted data */
$name=$_REQUEST['name'];
$email=$_REQUEST['email'];
$message=$_REQUEST['message'];

if (($name=="")||($email=="")||($message==""))
    {
    echo "All fields are required, please fill <a href=\"\">the form</a> again.";
    }
else{        
    $from="From: $name<$email>\r\nReturn-path: $email";
    $subject="Message sent using your contact form";
    mail("aridjemana@email.com", $subject, $message, $from);
    echo "Email sent!";
    }
endif;
?>

PHP表单错误，新手

5 个答案: