How to redirect if user already logged in
Question
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">
<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($_SESSION['username'])){
redirect();
}
?>
But it doesn't redirect the user when I logged in with my account that I created. Why is that?
6 answers
solution1
12 2010-12-24 10:05:23
header(' URL= index.php');
should be
header ( 'Location: index.php' );
Also you might want to put a die() statement after the call to header() so that you stop the execution of your script completely.
And you should probably move the call to redirect() above any other output since HTTP headers must be the first thing in the response. It's possible that this is also the cause of your problem.
solution2
10 2010-12-24 10:05:29
Change the redirect() function to:
header('Location: index.php');
And move the call to redirect above all the html output:
<?php session_start();
if(isset($_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($_SESSION['username'])) {
redirect();
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" id="jmtoday" class=" no_js">
<head>
<link href='icon.jpg' rel='icon' type='image/jpg'/>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-language" content="en" />
<LINK REL=StyleSheet HREF="Mainstyles.css" TYPE="text/css"></link>
<Title>Sign up | JMToday</title>
</head>
<body>
?>
solution3
6 ACCPTED 2010-12-24 10:06:06
function redirect() {
header('location:index.php');
}
solution4
1 2010-12-24 10:07:43
它的header('Location: index.php');
solution5
0 2015-01-12 17:07:45
if you want to redirect immediately, then
function redirect(){
header("Location: home.php");
}
if you want to redirect with some delay, then
function redirect(){
header("Refresh: 0;url=default.php");
}
increase the 0 in "Refresh:0" to introduce greater delay.
you might use this to redirect after showing some notification/message to the user.
Note if you are having some trouble in redirecting, then put "exit()" at the end of function
solution6
0 2022-12-30 22:36:52
<?php
session_start();
if((isset($_SESSION["username"])))
{
header("Location: home.php");
}
?>
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