I have test.php:
<html>
<?php
if (!isset($_SESSION))
{
echo 'session is not yet set';
session_start();
$_SESSION['comments'] = array();
}
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
<input type="text" name="comment">
Click the button!
<input type="submit"/>
</form>
<?php
array_push($_SESSION['comments'], $_GET['comment']);
echo 'Current array count: ' . count($_SESSION['comments']) . '<br>';
foreach($_SESSION['comments'] as $comm)
{
echo $comm.'<br>';
}
?>
</html>
What should happen is that any text entered in the textbox should be pushed to the session array, but every time I click on submit, what is printed is the text I just entered instead of appending/storing the previous entries. I only get 1 as the array count all the time.
Every time I hit submit, session is not yet set always shows at the top of the page even when I have the if condition.
I can't seem to find what's wrong?
You need to do this:
<?php
session_start();
if (!isset($_SESSION))
{
?>
Otherwise you have header output from the HTML tag and the session can't start properly.
You should start the session at the top of the page always.
session_start(); //start the session
Then we can check session is exist or not.
if(!isset($_SESSION['user'])){
// your code
}else{
// your code
}
session_start() does not just start a NEW session. If the client already has a session it resumes that session. PHP Manual
If you are using sessions, just have session_start(); at the top of the page and PHP will do the lifting of starting or resuming a session.
Related
I would like to maintain 3 $_Session variables after login. My login modal submits to my index.php page and this seems to be the only place I can access the session variables I set when the user logs in. How do I pass these variables to the next page the user visits? I know I can use hidden inputs in forms but what if the brows the site using the menu? I would like to store a users session variables in a session include file but I have the same issue passing the values of the variables from page to page.
-Mike
File a.php:
<?php
session_start();
$_SESSION['saveme'] = 'from file A';
?>
File b.php:
<?php
session_start();
echo $_SESSION['saveme']; // if you visited a.php previously, you will see "from file A"
?>
Setting a session variable in any file makes it available anywhere else.
You can store you values in session on one page(index in your case as you mentioned) then later on you can get those values on any page if session in started on that page. Session store those value till same session alive.
code to set values in session:
<?php
// Start the session
session_start();
?>
<?php
// Set session variables
$_SESSION["xyz"] = "xyz";
$_SESSION["abc"] = "abc";
echo "Session variables are set.";
?>
Code to get session values:
<?php
// Echo session variables that were set on previous page
echo "value of xyz is " . $_SESSION["xyz"] . ".<br>";
echo "value of abc is " . $_SESSION["abc"] . ".";
?>
The form of your modal
<form action="index.php" method="post">
Username <input type="text" name="username" />
Password <input type="password" name="password" />
</form>
Then you catch it in your index.php
<?php
session_start();
if (isset($_POST['username']) && isset($_POST['password'])) {
// Check if user exists and password matches
$_SESSION['username'] = $_POST['username'];
$_SESSION['logintime'] = time();
$_SESSION['something'] = 'else';
}
In any other page you can use the values like
<?php
session_start();
if (isset($_SESSION['username'])) {
echo 'Welcome ' . $_SESSION['username'];
}
All who have provided answers thank you. This overlooked detail was all on me and though I have been out of the dev game for a while I should have known better.
My hosting service by default makes all file permissions read/write only...to access session variables I changed to read/write/execute and was successful.
Again thanks!
I am totally confused with session variables. I thought that if I set a session variable, then that variable will be available in any php document that begins with session_start. But it's not working.
Form:
<?php
session_start();
if(isset($_POST['hour'])) {
$_SESSION['hour'] = $_POST['hour'];
}
?>
<!DOCTYPE html>
<html>
<body>
<form action='viewA.php' method='post'>
<input type="text" name='hour' value='24'>
<input type ='submit' name= 'submit' value='submit'>
</form>
</body>
</html>
I post to viewA.php, and it works:
<?php
$hour = $_POST['hour'];
echo 'I am view A, and hour is '.$hour;
?>
<html>
<a href='View_B.php'>See View B</a>
<a href='TEST_form.php' >Choose another hour</a>
</html>
The file viewA.php has a link to View_B.php; here's View_B's code:
<?php
session_start();
print_r($_SESSION);
//$hour = $_SESSION['hour'];
//echo '... and in view B, hour is '.$hour;
?>
<html>
<a href='aatestform.php' >Choose another hour</a>
</html>
No matter what I put into the input in the form, the print_r($_SESSION); View_B outputs only Array ( [hour] => 13 ), which is the first hour I chose way back when. I type in "22"; it outputs 13. I type in "08", it outputs 13.
According to w3schools, "To change a session variable, just overwrite it"
What am I doing wrong? Please help!
In your viewA.php you don't store / overwrite the session variable with the $_POST value.
You just do it in your TEST_form.php which doesn't get any $_POST so your if(isset(... is useless.
Your post destination (the action) is viewA.php, this means that your request will be made to viewA.php.
You're using session variabiles only in the form page and in View_B.php.
If you look carefully at your code in ViewA.php, you'll see that you're working only with POST variables, not session variables.
This php code, that you have in your form page
<?php
session_start();
if(isset($_POST['hour'])) {
$_SESSION['hour'] = $_POST['hour'];
}
?>
Should be moved to viewA.php.
Doing this, viewA.php will check if the POST variable "hours" is set. In that case, it overwrite (or create) the session variable "hours".
I hate to say it but I have been working on what should have been a 30 minute assignment for a good 6 hours now with little to no progress. I am attempting to capture a name and email in a form, and set them to cookies that will last 10 minutes. While the cookies are active, the page should skip the form and just display the input. I have tried this with both cookies and sessions and cannot get it to work.
At this point I have written and deleted at least a hundred lines of code and just can't really see what the problem is. This is my first time working with PHP. Any help would be appreciated.
Currently this code creates the form, takes the info and posts it to the page correctly. When I go back to the page, it shows the form again. I assume this means the cookie isn't setting / sticking.
<?php
if (!empty($_POST)) {
setcookie('Cname',$_POST['name'], time()+600);
setcookie('Cemail', $_POST['email'], time()+600);
// header("Location:HW2.php");
}
?>
<html>
<head>
<title> Assignment 2 Alcausin </title>
</head>
<body>
<?php
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);
$visibleForm = True;
if(isset($_COOKIE['name'])){
$visibleForm = False;
}
if(isset($_POST['submit'])){
$visibleForm = False;
echo "Your Name: ";
echo $_COOKIE['Cname'];
echo "<br>";
echo "Your Email: ";
echo $_COOKIE['Cemail'];
}
if($visibleForm){ // close php if form is displayed
?>
<form action ="HW2.php" method="post">
Name:<font color = red>*</font> <input type="text" name="name"><br>
E-mail:<font color = red>*</font> <input type="text" name="email"><br>
<input type="submit" name="submit" value="Submit">
</form>
<?php // back to php
}
?>
</body>
</html>
I rewrote your script using sessions, so that your data is actually stored on the server and the client only has a session cookie which is a reference to the server-side data, so the client has no way of tampering with that data.
While this may not be important for your homework, this is definitely important when you deal with user accounts and privileges (imagine an "admin" cookie that tells if the user is admin or not - anyone can manually set that cookie and that's it, he's an admin on your website).
This wasn't tested and may not work at all - feel free to downvote my answer if that's the case.
<?php
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);
ini_set("session.cookie_lifetime","600"); // sets the session cookie's lifetime to 10 minutes / 600 seconds
session_start(); // starts the session, this will create a new session cookie on the client if there's not one already
if (isset($_POST["name"]) && isset($_POST["email"])) { // if there's POST data
$_SESSION["name"] = $_POST["name"]; // this saves your values to the session so you can retrieve them later
$_SESSION["email"] = $_POST["email"]; // same here
};
?>
<html>
<head>
<title> Assignment 2 Alcausin </title>
</head>
<body>
<?php
$visibleForm = !isset($_SESSION["name"]); // visibleForm will be the opposite of isset, so if there's a "name" in the session then the form will be invisible
if ($visibleForm) { // if there's no session data, we display the form
echo '<form action ="HW2.php" method="post">Name:<font color = red>*</font> <input type="text" name="name"><br>E-mail:<font color = red>*</font> <input type="text" name="email"><br><input type="submit" name="submit" value="Submit"></form>';
} else { // this means there is some data in the session and we display that instead of the form
echo "Your Name: ";
echo $_SESSION["name"];
echo "<br>";
echo "Your Email: ";
echo $_SESSION["email"];
};
?>
</body>
</html>
First of all, you must add the session_start() at the highest level of your code as it is essential for any of this to work. session_start() actually generates the PHPSESSID cookie and is also the session identifier; you won't need to set anything to the PHPSESSID cookie using setcookie() if you use session_start().
For a basic way to do what you're trying to achieve, I'd try to set sessions whenever the page loads and if there is a current session, then it will skip the form like you said.
$_SESSION['SESSID'] = $someVar;
$_SESSION['SESSNAME'] = "someOtherVar";
Then right before your form, check if any of those are set by using
if(isset($someVar) && isset($someOtherVar))
You know the deal.
Then create a button that does a session_destroy() so that it ends the current session.
Is there any way to know if the page was refreshed or data was posted data on the same page?
To be little more specific:
I have to post data on the same page.
This affects the where condition of the query.
If the page was refreshed, then the where condition must be 1.
Otherwise, where condition contains some id to get specific data from
the table.
Your best bet is to use PHP sessions, along with your submitted data in $_POST. Let's presume for this example you have the following form:
<form action="this_page.php" method="post">
<input type="text" name="important-info" />
<input type="submit" value="Submit" />
</form>
Then elsewhere in the same page is the PHP code:
<?php
// example code
session_start();
if (!isset($_SESSION['previousVisitor']) && isset($_POST['important-info'])) {
// this is a new visitor who has submitted the form
$_SESSION['previousVisitor'] = true;
// where is based on $_POST['important-info']
} else () {
// where is 1
}
// close the session after you do what you need - this stops large pages causing hang
session_destroy();
Please note that they can clear this session variable by deleting their cookies.
on the top of the page just include
if(isset($_POST['name']) && $_POST['name']!=''){
//your code goes here
}
I suggest you to check request
//Here goes the code
session_start();
$counter = 0;
$counter = (isset($_SESSION['param'])) ? $counter++ : 0;
if($counter == 0)
echo "data GET or POST";
else
echo "refreshed";
** If you want only POST param, use $_POST instead of $_REQUEST
My php website flows like this:
Page1.php has an html form which POSTs to Page2.php
Page2.php stores all the POST data into SESSION variables and has a button leading to Page3.php
Page3.php has another form which POSTs its data to Page4.php
Page4.php then stores all its POST data into SESSION variables
My problem is that it may be nessicary for a user to click the back button on Page4.php to go back to Page3.php and change some input. AS im sure your all aware when they get back to Page3.php the form will be blank as the entire page is re-rendered in its default state.
To get around this and re-display the user's previous input im doing this:
<input value="<?php echo $_POST["guest1Ticket"];?> " type="text" name="guest1Ticket" id="guest1Ticket" onblur="isTicketNumber(this)" size ="22"/>
This being the important part - <?php echo $_POST["guest1Ticket"];?>
This works but creates another problem for me. If the user goes back to Page1.php (before colsing their browser) and starts the process over again when they get to Page3.php the data from their last run through will be loaded into the form.
What I figure I need to do is clear all of the sdession variables when the user visists Page1.php. I tried to to that like this:
<?php
session_start();
session_unset();
session_destroy();
?>
(The above is at the very top of my file with no whitespace before the first character.)
No Warnings are generated when Page1.php loads but the session variables are not getting unset. When I get to Page3.php the data from the last run is still being entered into the form.
How can I clear my session data correctly?
BTW I only need this to work in Chrome and thats where im testing.
Only use session_unset() for older deprecated code that does not use $_SESSION.
see session_destroy manual
example you can try and see how it works
session.php
<?php
session_start();
$_SESSION = array('session1'=>1,'session2'=>2);
echo $_SESSION['session1']; //1
$_SESSION['session1'] = 3;
echo "<pre>";
print_r($_SESSION); //session one now updated to 3
echo "</pre>";
$_SESSION = array();
if ($_SESSION['session1']) {
echo $_SESSION['session1']; // IS NOW EMPTY
} else {
echo "woops... nothing found";
}
?>
<p>
<a href="destroyed.php">NOW GOING TO DESTROYED PHP<a/>
</p>
<?php
session_destroy();
?>
destroyed.php
<?php
session_start(); // calling session start first on destroyed.php
print_r($_SESSION); // prints Array ( )
?>
From the documentation:
If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is used,
use unset() to unregister a session variable, i.e. unset ($_SESSION['varname']);
And take care about session_destroy:
session_destroy destroys all of the data associated with the current session. It does not unset any of the global variables associated with the session
Use session_unset(). Like this:
<?php session_start(); ?><!DOCTYPE html>
<html>
<body>
<?php
$_SESSION["variabletounset"] = "I am going to be unset soon along with all of the other session variables.";
print '<pre>' . "\n";
print_r($_SESSION);
print ' </pre>' . "\n";
session_unset();
print ' <pre>' . "\n";
print_r($_SESSION);
print ' </pre>' . "\n";
?>
</body>
</html>
This would output:
Array
(
variabletounset => I am going to be unset soon along with all of the other session variables.
)
Array
(
)