How to redirect if user already logged in_问答_开发者

How to redirect if user already logged in

开发者 https://www.devze.com 2023-02-01 05:50 出处：网络

I have a login script that does this: $_SESSION[\'username\']=$username; $_SESSION[\'password\']=$password;

I have a login script that does this:

$_SESSION['username']=$username;

$_SESSION['password']=$password;

If the user logged in succesfully. And so I edited the signup page to do this:

<?php

function redirect() {
    header(' URL= index.php');
}

?>
<?php session_start(); ?>  

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">开发者_开发技巧;
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" id="jmtoday" class=" no_js">
<head>
 <link href='icon.jpg' rel='icon' type='image/jpg'/>
 <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
 <meta http-equiv="Content-language" content="en" />
 <LINK REL=StyleSheet HREF="Mainstyles.css" TYPE="text/css"></link>
 <Title>Sign up | JMToday</title>
</head>
<body>
<?php
  if(isset($_SESSION['username'])){
   redirect();
  }
?>

But it doesn't redirect the user when I logged in with my account that I created. Why is that?

header(' URL= index.php');

should be

header ( 'Location: index.php' );

Also you might want to put a die() statement after the call to header() so that you stop the execution of your script completely.

And you should probably move the call to redirect() above any other output since HTTP headers must be the first thing in the response. It's possible that this is also the cause of your problem.

Change the redirect() function to:

header('Location: index.php');

And move the call to redirect above all the html output:

<?php session_start();
if(isset($_SESSION['username'])) {
    redirect();
} ?>

From the header() docs:

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.

This is what it should look like in the end, taking @Jan's advice to add a call to die():

<?php
function redirect($DoDie = true) {
    header('Location: index.php');
    if ($DoDie)
        die();
}
php session_start();
if(isset($_SESSION['username'])) {
    redirect();
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" id="jmtoday" class=" no_js">
<head>
 <link href='icon.jpg' rel='icon' type='image/jpg'/>
 <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
 <meta http-equiv="Content-language" content="en" />
 <LINK REL=StyleSheet HREF="Mainstyles.css" TYPE="text/css"></link>
 <Title>Sign up | JMToday</title>
</head>
<body>
?>

function redirect() {
    header('location:index.php');
}

It's header('Location: index.php');

if you want to redirect immediately, then

function redirect(){
    header("Location: home.php");
}

if you want to redirect with some delay, then

function redirect(){
    header("Refresh: 0;url=default.php");
}

increase the 0 in "Refresh:0" to introduce greater delay.

you might use this to redirect after showing some notification/message to the user.

Note if you are having some trouble in redirecting, then put "exit()" at the end of function

<?php
  session_start();

  if((isset($_SESSION["username"]))) 
  {
   header("Location: home.php");
  }
?>

How to redirect if user already logged in

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