i have a form and when i post it i create a cookie, then i read the cookie and if isset then do something:
inside read.php
<?php if (isset($_COOKIE['voteforme'])) {
echo 'You voted this profile';
} else {?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="hidden" name="vote_points" id="vote_points" value="1000" />
<input type="submit" name="votes_send" id="votes_send" value="Vote for me" />
</form>
<?php } ?>
then i do some cookie creation inside 'create.php':
if (isset($_POST['votes_send'])){
$get_vote_for_me = $_POST['vote_points'];
$get_talent_id = $_POST['talent_id'];
$value1 = "voteforme";
$value2 = "voteforme_points";
setcookie($value1,$value2, time()+3600*24*7);
}
this script is creating the cookie i need. basically if the cookie $_COOKIE['voteforme'] is set then show a message, else show the form.
the problem i have is that i need to refresh the page a second time for the page to read the cookie and see if exists or not.
the file structure is index.php where i include the read.php and 'create.php'
any ideas??
thanks
edit:
even if i set the form action to any of those files the result is the same
edit, index.php structure:
<?php
require_once("read.php");
include 'create.php';
?>
<!doctype html>
<head>...
<body>...
<div id="tab5" class="tab_content">
<?php read();?> // the read.php it's a function
</div>
...
the read.php i am requiring it it at the top but i'm not actually calling git until inside the body as a function
adit:
i've also tried to add the setcookie inside the else statement inside the 'read.php', but there it doesn't get created
Why don't you check for the cookie set after you set the cookie? Then proceed to update your page. You just can't print anything to the page before doing your cookie work.
Another solution would be to use javascript to reduce the number of reloads.
A third idea would be to use a global variable which you can check in addition to the cookie -- that way if you set the cookie you would execute the appropriate code based on the global variable.
I would suggest you separate the files. POST data to create.php and add a redirection in create.php back to index.php. This way page will load and it will be able to read your cookie.
or you could try this, if not done already:
first include create.php and then read.php
setcookie() doesn't set the value in $_COOKIE immediately, it'll only be there after the client sends another request with the cookie. You can set it manually if you want.
Related
It seems pretty simple but I can't find a good way to do it.
Say in the first page I create a variable
$myVariable = "Some text";
And the form's action for that page is "Page2.php". So in Page2.php, how can I have access to that variable? I know I can do it with sessions but I think it's too much for a simple string, and I do only need to pass a simple string (a file name).
How can I achieve this?
Thanks!
HTML / HTTP is stateless, in other words, what you did / saw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.
Session:
//On page 1
$_SESSION['varname'] = $var_value;
//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.
Cookie:
//One page 1
$_COOKIE['varname'] = $var_value;
//On page 2
$var_value = $_COOKIE['varname'];
The big difference between sessions and cookies is that the value of the variable will be stored on the server if you're using sessions, and on the client if you're using cookies. I can't think of any good reason to use cookies instead of sessions, except if you want data to persist between sessions, but even then it's perhaps better to store it in a DB, and retrieve it based on a username or id.
GET and POST
You can add the variable in the link to the next page:
Page2
This will create a GET variable.
Another way is to include a hidden field in a form that submits to page two:
<form method="get" action="page2.php">
<input type="hidden" name="varname" value="var_value">
<input type="submit">
</form>
And then on page two:
//Using GET
$var_value = $_GET['varname'];
//Using POST
$var_value = $_POST['varname'];
//Using GET, POST or COOKIE.
$var_value = $_REQUEST['varname'];
Just change the method for the form to post if you want to do it via post. Both are equally insecure, although GET is easier to hack.
The fact that each new request is, except for session data, a totally new instance of the script caught me when I first started coding in PHP. Once you get used to it, it's quite simple though.
Thanks for the answers above. Here's how I did it, I hope it helps those who follow. I'm looking to pass a registration number from one page to another, hence regName and regValue:
Create your first page, call it set_reg.php:
<?php
session_start();
$_SESSION['regName'] = $regValue;
?>
<form method="get" action="get_reg.php">
<input type="text" name="regName" value="">
<input type="submit">
</form>
Create your second page, call it get_reg.php:
<?php
session_start();
$regValue = $_GET['regName'];
echo "Your registration is: ".$regValue.".";
?>
<p>Back to set_reg.php
Although not as comprehensive as the answer above, for my purposes this illustrates in simple fashion the relationship between the various elements.
Passing data in the request
You could either embed it as a hidden field in your form, or add it your forms action URL
echo '<input type="hidden" name="myVariable" value="'.
htmlentities($myVariable).'">';
or
echo '<form method="POST" action="Page2.php?myVariable='.
urlencode($myVariable).'">";
Note this also illustrates the use of htmlentities and urlencode when passing data around.
Passing data in the session
If the data doesn't need to be passed to the client side, then sessions may be more appropriate. Simply call session_start() at the start of each page, and you can get and set data into the $_SESSION array.
Security
Since you state your value is actually a filename, you need to be aware of the security ramifications. If the filename has arrived from the client side, assume the user has tampered with the value. Check it for validity! What happens when the user passes the path to an important system file, or a file under their control? Can your script be used to "probe" the server for files that do or do not exist?
As you are clearly just getting started here, its worth reminding that this goes for any data which arrives in $_GET, $_POST or $_COOKIE - assume your worst enemy crafted the contents of those arrays, and code accordingly!
There are three method to pass value in php.
By post
By get
By making session variable
These three method are used for different purpose.For example if we want to receive our value on next page then we can use 'post' ($_POST) method as:-
$a=$_POST['field-name'];
If we require the value of variable on more than one page than we can use session variable as:-
$a=$_SESSION['field-name];
Before using this Syntax for creating SESSION variable we first have to add this tag at the very beginning of our php page
session_start();
GET method are generally used to print data on same page which used to take input from user. Its syntax is as:
$a=$_GET['field-name'];
POST method are generally consume more secure than GET because when we use Get method than it can display the data in URL bar.If the data is more sensitive data like password then it can be inggeris.
try this code
using hidden field we can pass php varibale to another page
page1.php
<?php $myVariable = "Some text";?>
<form method="post" action="page2.php">
<input type="hidden" name="text" value="<?php echo $myVariable; ?>">
<button type="submit">Submit</button>
</form>
pass php variable to hidden field value so you can access this variable into another page
page2.php
<?php
$text=$_POST['text'];
echo $text;
?>
Sessions would be the only good way, you could also use GET/POST but that would be potentially insecure.
**page 1**
<form action="exapmple.php?variable_name=$value" method="POST">
<button>
<input type="hidden" name="x">
</button>
</form>`
page 2
if(isset($_POST['x'])) {
$new_value=$_GET['variable_name'];
}
It works.
Send data throw URL, without form.
$upit = "SELECT * FROM usluga";
$data = $mysql->query($upit);
while ($row = mysqli_fetch_object($data))
{
echo "<a href='"."index.php?tretmanId=$row->tretman_id"."'>$row->naziv</a>";
echo "<br><br>";
}
and you can get this value on the target page with "$_GET['name from URL']", like this
$TrermanIdFromUrl = $_GET['tretmanId'];
You can for example call the page you want by including variables in the url:
header("Location: ../signup.php?newpwd=passwordupdated");
And on your signup.php page, you would have
if (isset($_GET['newpwd']) && $_GET['newpwd'] == "passwordupdated") {
//code here
}
So when the user clicks submit, I would like it to take the form inputs and permanently save them to a variable. I'm not to sure how this could be done, but I am aware of this method, but it doesn't save it permanently.
<?php
$test = %_POST["example"];
?>
<form action="#" method="post">
Example Input: <input type="text" name="example"><br>
<input type="submit" name="submit"><br>
</form>
I then put
<?php echo $test ?>
which displayed my variable value, but as soon as the page is refreshed it's gone because of POST. How can I do something similar but when the page is refreshed it's still there?
I am open to other alternatives.
The problem is that $_POST variable lives only "per request", as you have already seen yourself when refreshing the page.
You can however use sessions to keep the variable alive as long as the session lives. Or you save the data to a database and fetch the data again when requesting the page.
Regarding sessions, you would do that like this:
<?php
session_start();
if (isset($_POST['example'])) {
$test = $_POST["example"];
$_SESSION['formData'] = $test;
}
if (isset($_SESSION['formData'])) {
echo $_SESSION['formData'];
}
<?php
For more information and a simple tutorial see: http://www.w3schools.com/php/php_sessions.asp
It seems pretty simple but I can't find a good way to do it.
Say in the first page I create a variable
$myVariable = "Some text";
And the form's action for that page is "Page2.php". So in Page2.php, how can I have access to that variable? I know I can do it with sessions but I think it's too much for a simple string, and I do only need to pass a simple string (a file name).
How can I achieve this?
Thanks!
HTML / HTTP is stateless, in other words, what you did / saw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.
Session:
//On page 1
$_SESSION['varname'] = $var_value;
//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.
Cookie:
//One page 1
$_COOKIE['varname'] = $var_value;
//On page 2
$var_value = $_COOKIE['varname'];
The big difference between sessions and cookies is that the value of the variable will be stored on the server if you're using sessions, and on the client if you're using cookies. I can't think of any good reason to use cookies instead of sessions, except if you want data to persist between sessions, but even then it's perhaps better to store it in a DB, and retrieve it based on a username or id.
GET and POST
You can add the variable in the link to the next page:
Page2
This will create a GET variable.
Another way is to include a hidden field in a form that submits to page two:
<form method="get" action="page2.php">
<input type="hidden" name="varname" value="var_value">
<input type="submit">
</form>
And then on page two:
//Using GET
$var_value = $_GET['varname'];
//Using POST
$var_value = $_POST['varname'];
//Using GET, POST or COOKIE.
$var_value = $_REQUEST['varname'];
Just change the method for the form to post if you want to do it via post. Both are equally insecure, although GET is easier to hack.
The fact that each new request is, except for session data, a totally new instance of the script caught me when I first started coding in PHP. Once you get used to it, it's quite simple though.
Thanks for the answers above. Here's how I did it, I hope it helps those who follow. I'm looking to pass a registration number from one page to another, hence regName and regValue:
Create your first page, call it set_reg.php:
<?php
session_start();
$_SESSION['regName'] = $regValue;
?>
<form method="get" action="get_reg.php">
<input type="text" name="regName" value="">
<input type="submit">
</form>
Create your second page, call it get_reg.php:
<?php
session_start();
$regValue = $_GET['regName'];
echo "Your registration is: ".$regValue.".";
?>
<p>Back to set_reg.php
Although not as comprehensive as the answer above, for my purposes this illustrates in simple fashion the relationship between the various elements.
Passing data in the request
You could either embed it as a hidden field in your form, or add it your forms action URL
echo '<input type="hidden" name="myVariable" value="'.
htmlentities($myVariable).'">';
or
echo '<form method="POST" action="Page2.php?myVariable='.
urlencode($myVariable).'">";
Note this also illustrates the use of htmlentities and urlencode when passing data around.
Passing data in the session
If the data doesn't need to be passed to the client side, then sessions may be more appropriate. Simply call session_start() at the start of each page, and you can get and set data into the $_SESSION array.
Security
Since you state your value is actually a filename, you need to be aware of the security ramifications. If the filename has arrived from the client side, assume the user has tampered with the value. Check it for validity! What happens when the user passes the path to an important system file, or a file under their control? Can your script be used to "probe" the server for files that do or do not exist?
As you are clearly just getting started here, its worth reminding that this goes for any data which arrives in $_GET, $_POST or $_COOKIE - assume your worst enemy crafted the contents of those arrays, and code accordingly!
There are three method to pass value in php.
By post
By get
By making session variable
These three method are used for different purpose.For example if we want to receive our value on next page then we can use 'post' ($_POST) method as:-
$a=$_POST['field-name'];
If we require the value of variable on more than one page than we can use session variable as:-
$a=$_SESSION['field-name];
Before using this Syntax for creating SESSION variable we first have to add this tag at the very beginning of our php page
session_start();
GET method are generally used to print data on same page which used to take input from user. Its syntax is as:
$a=$_GET['field-name'];
POST method are generally consume more secure than GET because when we use Get method than it can display the data in URL bar.If the data is more sensitive data like password then it can be inggeris.
try this code
using hidden field we can pass php varibale to another page
page1.php
<?php $myVariable = "Some text";?>
<form method="post" action="page2.php">
<input type="hidden" name="text" value="<?php echo $myVariable; ?>">
<button type="submit">Submit</button>
</form>
pass php variable to hidden field value so you can access this variable into another page
page2.php
<?php
$text=$_POST['text'];
echo $text;
?>
Sessions would be the only good way, you could also use GET/POST but that would be potentially insecure.
**page 1**
<form action="exapmple.php?variable_name=$value" method="POST">
<button>
<input type="hidden" name="x">
</button>
</form>`
page 2
if(isset($_POST['x'])) {
$new_value=$_GET['variable_name'];
}
It works.
Send data throw URL, without form.
$upit = "SELECT * FROM usluga";
$data = $mysql->query($upit);
while ($row = mysqli_fetch_object($data))
{
echo "<a href='"."index.php?tretmanId=$row->tretman_id"."'>$row->naziv</a>";
echo "<br><br>";
}
and you can get this value on the target page with "$_GET['name from URL']", like this
$TrermanIdFromUrl = $_GET['tretmanId'];
You can for example call the page you want by including variables in the url:
header("Location: ../signup.php?newpwd=passwordupdated");
And on your signup.php page, you would have
if (isset($_GET['newpwd']) && $_GET['newpwd'] == "passwordupdated") {
//code here
}
I use the following PHP code and HTML form to pass the "item_name" value to downloading page.
<?php
session_start();
$_SESSION['item_name']="item_name";
?>
...
<form action="download.php" method="post">
<input type="hidden" name="item_name" value="133076">
<input type="submit" value="download">
</form>
I receive and use the "item_name" value on downloading page like this.
<?php
session_start();
$item_name=$_POST["item_name"];
?>
All this works fine, but I have the following problem that I hope to solve here. After initial click I want to come back to the same html page like this:
<form action="" method="post">
then do something using JavaScript, generate the link to "download.php" and after that be able to download the file. The problem is that by the time when I'm clicking the newly generated link to go to "download.php" the
$_SESSION['item_name']="item_name";
is already lost. So how I can preserve this Session variable to use it on download page?
Thanks.
On your download.php page, you need to set the variable as a session variable:
<?php
session_start();
$_SESSION['item_name'] = $_POST["item_name"];
?>
By doing the above, the variable will be stored in the PHP session and will be available wherever you call session_start().
The way you have it right now is:
<?php
session_start();
$item_name = $_POST["item_name"];
?>
which will make the variable available only within your download.php page and nowhere else.
It seems pretty simple but I can't find a good way to do it.
Say in the first page I create a variable
$myVariable = "Some text";
And the form's action for that page is "Page2.php". So in Page2.php, how can I have access to that variable? I know I can do it with sessions but I think it's too much for a simple string, and I do only need to pass a simple string (a file name).
How can I achieve this?
Thanks!
HTML / HTTP is stateless, in other words, what you did / saw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.
Session:
//On page 1
$_SESSION['varname'] = $var_value;
//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.
Cookie:
//One page 1
$_COOKIE['varname'] = $var_value;
//On page 2
$var_value = $_COOKIE['varname'];
The big difference between sessions and cookies is that the value of the variable will be stored on the server if you're using sessions, and on the client if you're using cookies. I can't think of any good reason to use cookies instead of sessions, except if you want data to persist between sessions, but even then it's perhaps better to store it in a DB, and retrieve it based on a username or id.
GET and POST
You can add the variable in the link to the next page:
Page2
This will create a GET variable.
Another way is to include a hidden field in a form that submits to page two:
<form method="get" action="page2.php">
<input type="hidden" name="varname" value="var_value">
<input type="submit">
</form>
And then on page two:
//Using GET
$var_value = $_GET['varname'];
//Using POST
$var_value = $_POST['varname'];
//Using GET, POST or COOKIE.
$var_value = $_REQUEST['varname'];
Just change the method for the form to post if you want to do it via post. Both are equally insecure, although GET is easier to hack.
The fact that each new request is, except for session data, a totally new instance of the script caught me when I first started coding in PHP. Once you get used to it, it's quite simple though.
Thanks for the answers above. Here's how I did it, I hope it helps those who follow. I'm looking to pass a registration number from one page to another, hence regName and regValue:
Create your first page, call it set_reg.php:
<?php
session_start();
$_SESSION['regName'] = $regValue;
?>
<form method="get" action="get_reg.php">
<input type="text" name="regName" value="">
<input type="submit">
</form>
Create your second page, call it get_reg.php:
<?php
session_start();
$regValue = $_GET['regName'];
echo "Your registration is: ".$regValue.".";
?>
<p>Back to set_reg.php
Although not as comprehensive as the answer above, for my purposes this illustrates in simple fashion the relationship between the various elements.
Passing data in the request
You could either embed it as a hidden field in your form, or add it your forms action URL
echo '<input type="hidden" name="myVariable" value="'.
htmlentities($myVariable).'">';
or
echo '<form method="POST" action="Page2.php?myVariable='.
urlencode($myVariable).'">";
Note this also illustrates the use of htmlentities and urlencode when passing data around.
Passing data in the session
If the data doesn't need to be passed to the client side, then sessions may be more appropriate. Simply call session_start() at the start of each page, and you can get and set data into the $_SESSION array.
Security
Since you state your value is actually a filename, you need to be aware of the security ramifications. If the filename has arrived from the client side, assume the user has tampered with the value. Check it for validity! What happens when the user passes the path to an important system file, or a file under their control? Can your script be used to "probe" the server for files that do or do not exist?
As you are clearly just getting started here, its worth reminding that this goes for any data which arrives in $_GET, $_POST or $_COOKIE - assume your worst enemy crafted the contents of those arrays, and code accordingly!
There are three method to pass value in php.
By post
By get
By making session variable
These three method are used for different purpose.For example if we want to receive our value on next page then we can use 'post' ($_POST) method as:-
$a=$_POST['field-name'];
If we require the value of variable on more than one page than we can use session variable as:-
$a=$_SESSION['field-name];
Before using this Syntax for creating SESSION variable we first have to add this tag at the very beginning of our php page
session_start();
GET method are generally used to print data on same page which used to take input from user. Its syntax is as:
$a=$_GET['field-name'];
POST method are generally consume more secure than GET because when we use Get method than it can display the data in URL bar.If the data is more sensitive data like password then it can be inggeris.
try this code
using hidden field we can pass php varibale to another page
page1.php
<?php $myVariable = "Some text";?>
<form method="post" action="page2.php">
<input type="hidden" name="text" value="<?php echo $myVariable; ?>">
<button type="submit">Submit</button>
</form>
pass php variable to hidden field value so you can access this variable into another page
page2.php
<?php
$text=$_POST['text'];
echo $text;
?>
Sessions would be the only good way, you could also use GET/POST but that would be potentially insecure.
**page 1**
<form action="exapmple.php?variable_name=$value" method="POST">
<button>
<input type="hidden" name="x">
</button>
</form>`
page 2
if(isset($_POST['x'])) {
$new_value=$_GET['variable_name'];
}
It works.
Send data throw URL, without form.
$upit = "SELECT * FROM usluga";
$data = $mysql->query($upit);
while ($row = mysqli_fetch_object($data))
{
echo "<a href='"."index.php?tretmanId=$row->tretman_id"."'>$row->naziv</a>";
echo "<br><br>";
}
and you can get this value on the target page with "$_GET['name from URL']", like this
$TrermanIdFromUrl = $_GET['tretmanId'];
You can for example call the page you want by including variables in the url:
header("Location: ../signup.php?newpwd=passwordupdated");
And on your signup.php page, you would have
if (isset($_GET['newpwd']) && $_GET['newpwd'] == "passwordupdated") {
//code here
}