FileMaker API for PHP登录页面错误-无法修改标题信息

Question

I am in the process of developing a FileMaker driven website using the PHP API. 我正在使用PHP API开发FileMaker驱动的网站。 Been using the book "FileMaker API for PHP 13" which has been extremely useful thus far. 到目前为止，使用的是“ FileMaker API for PHP 13”一书，该书非常有用。

Anyways, I am trying to make a login page to access the database following Lesson 15 from the book. 无论如何，我试图在本书第15课之后创建一个登录页面来访问数据库。 When I click on the login button I get the following error: 当我单击登录按钮时，出现以下错误：

Warning: Cannot modify header information - headers already sent by (output started at /htdocs/fm_api_for_php/Advanced/Lesson15/Login.php:22) in /htdocs/fm_api_for_php/Advanced/Lesson15/Login.php on line 56 警告：无法修改标头信息-已在第56行/htdocs/fm_api_for_php/Advanced/Lesson15/Login.php中发送的标头信息（输出从/htdocs/fm_api_for_php/Advanced/Lesson15/Login.php:22开始）

This is the code from the Login.php page: 这是Login.php页面中的代码：

<?php
# You have the start the session on the login page.
# The session_start() method MUST be before the html tag.
# Always set the $_SESSION login value to 0 on the login page to protect the other pages by default.
session_start();
$_SESSION['login']=0;
?>

<html>
<head>
<title>Login</title>
</head>
<body>

<!--
The purpose of this file is to show how to perform a log in procedure to protect web pages from unauthorized access.
The method uses 2 pages. Start at Loging.php. If login is sucessful the user is redirected to LoginSuccess.php.
LoginSuccess.php is the starting web page for your protected solution.
If users try to open a protected page without logging in they will be re-directed back to the login page.
-->

<?php
include ("../../Conn/dbaccess.php"); 
?>

<?php
# Check to see if the submit button was clicked and $_POST superglobals username and password are filled in.
# Then find the login record using the username and password. 
# Username is intended to be an email address.
# To search a FileMaker record for an email adderss with an "@" character you have to use the search operator "==" for match entire field.
# Safari will url encode the @ symbol as %40. This means that you have to use the urldecode function to convert %40 back to @.
# Password can be anything. Notice the use of the MD5 hash to enrcypt the data as a 32-bit hexadecimal number. That would send '1234' as "81dc9bdb52d04dc20036dbd8313ed055'.
# For this to work, the password would also need to be stored in the database as a MD5 hash when the user creates their record.
if(isset($_POST['Login']) and (!empty($_POST['username']) and !empty($_POST['password'])) )
    {
    $username = '==' . urldecode($_POST['username']);
    $password = md5($_POST['password']);
    $request = $fm->newFindCommand('Demo php');
    $request->addFindCriterion('UserName', $username);
    $request->addFindCriterion('Password', $password);
    $result = $request->execute();
    # Check for errors  if no records are found, find all all the records so FileMaker doesn't throw an error and crash the page.
    if (FileMaker::isError($result))
        {
        $request = $fm->newFindAllCommand('Demo php');
        $result = $request->execute();
        }
    # Set the $found variable with the number of records in the found set. There should only be 1 unique record.
    $found = $result->getFoundSetCount();
    if($found == 1)
        {
        # Set the $_SESSION superglobal 'login' value to 1 to indicate that the user is logged in.
        # This value will be checked on all the protected pages before the user can access the page.
        # Use the header() method to redirect the user to the LoginSuccess.php page.
        $_SESSION['login']=1;
        header("location:LoginSuccess.php");
        exit;
        }
    else
        # If there is more than one record in the found set set the $_SESSION 'login' value to 0.
        # This will prevent users from accessing any of the protected pages.
        # Set the $message variable to let the user know they tried an incorrect user name or password.
        # Echo the $message in the html of the form.
        {
        $_SESSION['login']=0;
        $message = 'Incorrect user name or password.';
        }
    }   
else
    # By default, the $message varible is set to ask the user to enter a user name and password.
    # Echo the $message in the html of the form.
    {
    $message = 'Please enter a user name and password.';
    }       

?>

<form action="Login.php" method="post">
<table border="0" cellspacing="3" cellpadding="3">
  <tr>
    <td>&nbsp;</td>
    <td><?php echo $message; ?></td>
  </tr>
  <tr>
    <td>User Name</td>
    <td><input name="username" type="text" /></td>
  </tr>
  <tr>
    <td>Password</td>
    <td><input name="password" type="password" /></td>
  </tr>
    <tr>
    <td>&nbsp;</td>
    <td><input name="Login" type="submit" value="login" /></td>
  </tr>
</table>
</form>

</body>
</html>

================ ================

Line 22 is: <?php 第22行是： <?php

Line 56 is: header("location:LoginSuccess.php"); 第56行是： header("location:LoginSuccess.php");

Can anyone shed any light on how to fix the error? 谁能阐明如何纠正错误？

Thanks in Advance! 提前致谢！ Paul 保罗

Answer 1

You should process your data first and then should output any html. 您应该先处理数据，然后再输出任何html。 try below code 尝试下面的代码

 <?php
  # You have the start the session on the login page.
  # The session_start() method MUST be before the html tag.
  # Always set the $_SESSION login value to 0 on the login page to protect 
  # the other pages by default.
   session_start();
      $_SESSION['login']=0;

    include ("../../Conn/dbaccess.php"); 


   # Check to see if the submit button was clicked and $_POST superglobals 
   #  username and password are filled in.
    # Then find the login record using the username and password. 
  # Username is intended to be an email address.
  # To search a FileMaker record for an email adderss with an "@" character 
   # you have to use the search operator "==" for match entire field.
  # Safari will url encode the @ symbol as %40. This means that you have to 
  #  use the urldecode function to convert %40 back to @.
    # Password can be anything. Notice the use of the MD5 hash to enrcypt 
   #  the data as a 32-bit hexadecimal number. That would send '1234' as 
    #  "81dc9bdb52d04dc20036dbd8313ed055'.
    # For this to work, the password would also need to be stored in the 
    # database as a MD5 hash when the user creates their record.
     if(isset($_POST['Login']) and (!empty($_POST['username']) and 
       !empty($_POST['password'])) )
       {
$username = '==' . urldecode($_POST['username']);
$password = md5($_POST['password']);
$request = $fm->newFindCommand('Demo php');
$request->addFindCriterion('UserName', $username);
$request->addFindCriterion('Password', $password);
$result = $request->execute();
# Check for errors  if no records are found, find all all the records so FileMaker doesn't throw an error and crash the page.
if (FileMaker::isError($result))
    {
    $request = $fm->newFindAllCommand('Demo php');
    $result = $request->execute();
    }
# Set the $found variable with the number of records in the found set. There should only be 1 unique record.
$found = $result->getFoundSetCount();
if($found == 1)
    {
       # Set the $_SESSION superglobal 'login' value to 1 to indicate that 
     #  the user is logged in.
    # This value will be checked on all the protected pages before the user can access the page.
    # Use the header() method to redirect the user to the LoginSuccess.php page.
    $_SESSION['login']=1;
    header("location:LoginSuccess.php");
    exit;
    }
else
       # If there is more than one record in the found set set the $_SESSION 
      # 'login' value to 0.
       # This will prevent users from accessing any of the protected pages.
       # Set the $message variable to let the user know they tried an 
      # incorrect user name or password.
      # Echo the $message in the html of the form.
      {
        $_SESSION['login']=0;
        $message = 'Incorrect user name or password.';
       }
}   
  else
   # By default, the $message varible is set to ask the user to enter a user 
    #name and password.
   # Echo the $message in the html of the form.
    {
    $message = 'Please enter a user name and password.';
   }       

  ?>
 <!--
    The purpose of this file is to show how to perform a log in procedure to 
    protect web pages from unauthorized access.
    The method uses 2 pages. Start at Loging.php. If login is sucessful the 
    user is redirected to LoginSuccess.php.
    LoginSuccess.php is the starting web page for your protected solution.
   If users try to open a protected page without logging in they will be re- 
   directed back to the login page.
    -->
  <html>
    <head>
    <title>Login</title>
   </head>
   <body>

     <form action="Login.php" method="post">
       <table border="0" cellspacing="3" cellpadding="3">
        <tr>
          <td>&nbsp;</td>
            <td><?php echo $message; ?></td>
            </tr>
           <tr>
        <td>User Name</td>
            <td><input name="username" type="text" /></td>
        </tr>
     <tr>
          <td>Password</td>
          <td><input name="password" type="password" /></td>
     </tr>
     <tr>
        <td>&nbsp;</td>
        <td><input name="Login" type="submit" value="login" /></td>
      </tr>
   </table>
  </form>

    </body>
 </html>
     `

FileMaker API for PHP登录页面错误-无法修改标题信息

问题描述

This is the code from the Login.php page: 这是Login.php页面中的代码：

1 个解决方案

解决方案1
0 已采纳 2018-05-16 05:58:46

FileMaker API for PHP登录页面错误-无法修改标题信息

问题描述

This is the code from the Login.php page: 这是Login.php页面中的代码：

1 个解决方案

解决方案1 0 已采纳 2018-05-16 05:58:46

解决方案1
0 已采纳 2018-05-16 05:58:46