i have a problem with rand function in php. i set random number on a $_SESSION and in other place echo this. but every time i echo $_SESSION, value on it is changed.
my code in page1:
session_start();
$_SESSION['y'] = rand(1,100);
echo $_SESSION['y'];
and in other page2 i write this:
session_start();
echo $_SESSION['y'];
how can i solve it?
note that page2 is appended with ajax to page1 when clicking on a button.
It sounds like you are including page 1 on page 2.
Option 1
Do not include page 1 on page 2.
Option 2
Check to see if the random number exists before setting it.
session_start();
if (! isset($_SESSION['y'])) {
$_SESSION['y'] = rand(1,100);
}
echo $_SESSION['y'];
Related
I created an app to receive and tally votes. I am trying to make the voter's selection carry over to a confirmation page so that I can display the name of the candidate for whom they voted on the confirmation page.
I am trying to use $_SESSION on the variable of the selected candidate from the voter's submission, and then call the variable on the confirmation page, however I continue to get undefined variable error.
voterSubmit.php:
<?php
$selectedCandidate = $_POST['candidateid'];
session_start();
$selection = $_SESSION[$selectedCandidate];
//Redirect to results page
header("Location: views/confirmation.php");
confirmation.php
<?php
session_start();
$_SESSION[$selectedCandidate] = $selection;
include "views/confirmation.php";
confirmation view:
<?php include "../partials/header.php"; ?>
<h1>Thanks For Your Vote!!</h1><br>
//This is where the error occurs (on my selection variable):
<h2>You voted for <?=$selection?>
View Results
<?php include "../partials/footer.php"; ?>
I want the name of the selected candidate to appear on the confirmation page by way of the $selection variable. However, all I receive on the front end is an "undefined variable" error. I also would like to note that instead of using the $selectedCandidate variable in my session, I have also tried grabbing the name directly by just using the name of the radio button selection as such:
$_SESSION['candidateid'] = $selection
I also would like to mention that i have tried the reverse:
on confirmation.php:
session_start();
$selection = $_SESSION[$selectedCandidate];
on voteSubmit.php:
session_start();
$_SESSION[$selectedCandidate] = $selection;
Your using the $_SESSION variable incorrectly.
Try:
voterSubmit.php:
<?php
$selectedCandidate = $_POST['candidateid'];
session_start();
$_SESSION['selectedCandidate'] = $selectedCandidate;
//Redirect to results page
header("Location: views/confirmation.php");
confirmation.php
<?php
session_start();
$selection = $_SESSION['selectedCandidate'];
include "views/confirmation.php";
voterSubmit.php looks ok... but I don't understand why you have include "views/confirmation.php"; in the confirmation.php file.
<?php
session_start();
$_SESSION[$selectedCandidate] = $selection;
include "views/confirmation.php";
Try coding your HTML/PHP this way:
<?php
/* confirmation.php */
session_start();
$_SESSION[$selectedCandidate] = $selection;
require_once("../partials/header.php");
//This is where the error occurs (on my selection variable):
echo <<<_STRT
<h1>Thanks For Your Vote!!</h1><br>
<h2>You voted for $selection</h2>
<p>View Results</p>
_STRT;
require_once("../partials/footer.php");
?>
I essentially eliminated a lot of start/stop code. The start of your PHP recalls the session and variable. Then I go into the HTML portion to provide the results to your site visitor. Give it a shot. Comment on it if it doesn't resolve your issue so we can rethink it.
I think session_start() needs to be the first line after the php tag.
$_SESSION is an array. So you need to assign it values like:
$_SESSION['keyname'] = $value;
voterSubmit.php:
<?php
session_start();
$_SESSION['selectedCandidate'] = $_POST['candidateid'];
//Redirect to results page
header("Location: views/confirmation.php");
confirmation.php
<?php
session_start();
$selection = $_SESSION['selectedCandidate'];
include "views/confirmation.php";
There are 2 issues in your code :
session_start() defined in the wrong place.
Wrong way of assigning value to your session variable.
Answer :
session_start() should be the first thing defined after your php
tag.
Correct way to declare session variables is : $_SESSION["selectedCandidate"] = $selectedCandidate; where, $selectedCandidate is the value to be assigned to your session variable, named selectedCandidate.
You have done 2 mistakes in your code:
1. Session should be defined in starting of page it means you have to define it like this:
<?php
session_start();
//php code goes here.
?>
2.wrong initialization of session variable .you should do it like this:
<?php
$_SESSION['selectedCandidate']=$selectedCandidate;
?>
Im trying to figure out how to use a php $_SESSION value. The situation is:
Main HTML site has an <iframe> that loads products.php
Within products.php a form submits and saves the two values below:
$_SESSION["subtotal"] = $_POST['SUBT'];
$_SESSION["tax"] = $_POST['TAX'];
These work well I can echo them no problem (within that page)
This page replaces products.php with confirmation.php
Once in the confirmation.php I am not able to grab the session values. I have tried the following:
<?php
session_start();
$_SESSION["subtotal"] = $_POST['SUBT'];
$_SESSION["tax"] = $_POST['TAX'];
echo $_SESSION["subtotal"];
echo $_SESSION["tax"];
echo $subtotal;
echo $tax;
?>
AND
$_SESSION["subtotal"] = $subtotal;
$_SESSION["tax"] = $tax;
echo $_SESSION["subtotal"];
echo $_SESSION["tax"];
echo $subtotal;
echo $tax;
?>
AND
$subtotal = $new_subtotal;
$tax = $new_tax;
echo $new_tax;
echo $new_subtotal;
?>
All have failed to see $_SESSION - Is the value getting lost with the <iframe> change?
I have used the following code on the products.php page to confirm the session were susecssfully created - They are:
echo $_SESSION["subtotal"]." stored in session <br />";
echo $_SESSION["tax"]." stored in session <br />";
NOTES:
Both confirmation & products.php are on the same server.
print_r($_SESSION); Returns BLANK array.
session_start() is at the very top of both pages
Use something like this:
products.php
<?php
session_start();
$_SESSION['myValue']=$_GET['YourFormElement'];
//or
$_SESSION['myValue']=3; // You can set the value however you like.
?>
Any other PHP page:
<?php
session_start();
echo $_SESSION['myValue'];
?>
A few notes to keep in mind though: You need to call session_start() BEFORE any output, HTML, echos - even whitespace.
You can keep changing the value in the session - but it will only be able to be used after the first page - meaning if you set it in page 1, you will not be able to use it until you get to another page or refresh the page.
The setting of the variable itself can be done in one of a number of ways:
$_SESSION['myValue']=1;
$_SESSION['myValue']=$var;
$_SESSION['myValue']=$_GET['YourFormElement'];
And if you want to check if the variable is set before getting a potential error, use something like this:
if(!empty($_SESSION['myValue'])
{
echo $_SESSION['myValue'];
}
else
{
echo "Session not set yet.";
}
I did that once by adding $_SESSION to url inside iframe and in file that is used in iframe I used that $_SESSION by $_GET.
I am not sure 100% but it should work as:
$session = $_SESSION['session'];
<iframe src="somePage.php?s=<?php echo $session; ?>"></iframe>
somePage.php
if(isset($_GET['s'])){
$session = $_GET['s'];
}
I want to generate a "number in sequence" in PHP on page refresh. Like
if I start with "1" then after page refresh, it should be "2". Please help.
You can achieve this using PHP SESSION
$_SESSION['number']++ will do the trick
PHP
<?php
session_start();
if (!isset($_SESSION['number'])) {
$_SESSION['number'] = 0;
}
$_SESSION['number']++;
?>
i have this array
$banners[0] ='a';
$banners[1] ='s';
$banners[2] ='d';
$banners[3] ='f';
I shuffle this array with
shuffle($banners);
and than I have new random list, which I can show with
echo $banners[0];
echo $banners[1];
echo $banners[2];
echo $banners[3];
and this new random list I want to put in session and send to another page on my website
This doesn't work
session_start();
$_SESSION['sesion'] = $banners;
another page:
$banners[0] ='a';
$banners[1] ='s';
$banners[2] ='d';
$banners[3] ='f';
$banners = $_SESSION['sesion'];
echo $banners[0];
echo $banners[1];
echo $banners[2];
echo $banners[3];
how I can send new shuffle banners to another page with session? thans
You need session_start() at the top of every page.
You missed the statement to start the session in the 2nd page.
So you need session_start(); to be executed before you can access a SESSION variable through $_SESSION[]
I've hit a dead end. I've been working on this for 3 weeks with no result.
I have 10 php pages (1.php, 2.php, ..., 10.php) and a starting page (start.php).
All I want to do is randomize the 10 pages with no repeat, so when I click "next" in the start.php it should go to one of the 10 pages (let's say for example it goes to 4.php). When I click "next" in 4.php it should redirect to another within the 10 pages except for 4.php.
It should continue this until all the numbers (1.php - 10.php) have been displayed. At this point it should randomize again. When I click "next" in the last number .php displayed, it should randomize the number and go back to the first on the random list.
Here's what I have so far:
start.php:
<?php $vidcount = 1; ?>
<? include ("source.php"); ?>
next page
source.php:
<?php
include ("start.php");
$numbers = range(1, $total_songs);
if(($vidcount == $total_songs)||($vidcount == 1)){
shuffle($numbers);
$vidcount = 1;
}
$nextvid[1] = $numbers[0];
$nextvid[2] = $numbers[1];
$nextvid[3] = $numbers[2];
$nextvid[4] = $numbers[3];
$nextvid[5] = $numbers[4];
$nextvid[6] = $numbers[5];
$nextvid[7] = $numbers[6];
$nextvid[8] = $numbers[7];
$nextvid[9] = $numbers[8];
$nextvid[10] = $numbers[9];
?>
1.php, 2.php, ... 10.php:
<?php
include("source.php");?>
<?php echo $vidcount; ?>
next page
<?php $vidcount++;?>
1.php - 10.php have the same code. I also have a source.php which is supposed to keep track of what number has been displayed and re-shuffle when all the numbers have been displayed.
Please help. I'll greatly appreciate any help I can get.
You don't have to use the above code, I don't mind starting from scratch if you have a different idea as long as the code I get works.
Well firstly why do you have ten files when you could just have one file and ?id=X in the URL? But never mind that.
Your best bet is to use a session variable. Something like this:
<?php
session_start();
if( !isset($_SESSION['sequence']) || !$_SESSION['sequence']) {
$_SESSION['sequence'] = shuffle(range(1,10));
}
$next = array_shift($_SESSION['sequence']);
// now use $next to create your "Next page" link.
?>