I like to pass the values to the webpage. I am having the array in which the values are stored dynamically. I like to pass this array to webpage through URL, website is in PHP Language. I am not aware of the variables present inside the PHP page.Did we have any types of technique or script to get the variable names which used in PHP code from the client side.
using method=get and $_Get method ,
Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and has limits on the amount of information to send.
example
<form action="welcome.php" method="get">
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
<input type="submit" value="Submit"/>
</form>
Welcome.php(get the value from url)
<?php
echo $_GET["fname"];
echo $_GET["age"];
?>
Related
I am trying to pass three parameters from one php file to another. Two of those parameters are in variables that are already determined long before the button is clicked to call the second php file, but one will be taken from a text box at the time the button is clicked.
So far I have the following (snippet) in the first php file. The two parameters that are in the existing variables show up in the URL just fine, but I can't figure out how to get the student number to be included. The URL just has "studentNumber=?&club=..."
Thanks!
<input type="text" id="studentNum" placeholder="Student Number">
<input type="button" value="Add Student" onclick="window.location = '<?php $url = 'http://npapps.peelschools.org/editor/add.php?studentNumber='.$_GET["StudentNum"].'&club='.$club.'&type='.$type.''; echo $url;?>'" />
Is it really necessary to use window.location? I would encourage you to use something like this
function doSubmit() {
document.getElementById("myformid").submit();
}
<form id="myformid" action="receivingPHP.php" method="POST">
<input id="studentnr" type="text" value="42" />
<button onclick="doSubmit()">Send</button>
</form>
Of course there is no receivingPHP.php file on the StackOverflow servers, so if you try this script you will reach a white page (close it in the top right corner where it says close)
If you use $_GET["StudentNum"], it must come from an HTML-form or a html-link:
example
or
<form method="GET"><input name="StudentNum" value="1337"></form>
Good luck
The URL of your current page needs to have had studentNum present as a query parameter to be able to use $_GET. For example, if current page URL =
http://npapps.peelschools.org/myotherpage.php?studentNum=100
then you can $_GET["studentNum"]. Also, if you are accessing this URL via ajax
http://npapps.peelschools.org/myotherpage.php
then it must be passed as a data parameter.
Find out what the URL of the page is where you have the HTML that you have shown, and if studentNum has not been passed as a query parameter or data parameter from however you get there (e.g. an anchor tag href) then add that parameter to the URL.
Ended up reworking it so that all the information was sent in a form rather than trying to embed it in a button. The secret came from w3schools where I figured out how to hide the known parameters in a hidden input element in the form, as follows:
<form action="add.php" method="GET">
<input name="studentNo" type="text" placeholder="Student Number" />
<input name="club" type="hidden" value="<?php echo htmlspecialchars($club); ?>" />
<input name="type" type="hidden" value="<?php echo htmlspecialchars($type); ?>" />
<input type="submit" value="Add Student" />
</form>
I have just spent 4 hours researching and nothing has fixed my problem, so here I am. I am trying to design my own little chunk file uploader, and all is working quite well.
I have a main upload page that lets you set a file to upload. It then automatically cuts the first chunk out of the bytes of the file, and puts it into a form, along with some other bits of information:
<form id="hiddenform" name="hiddenform" action="SecretChunkUploader.php" target="iframe" enctype="multipart/form-data" method="post">
<hidden id="Bytes" name="Bytes" value="" />
<hidden id="Pass" name="Pass" value="<?php echo $_POST['Pass'];?>" />
<hidden id="FileName" name="FileName" value="" />
<hidden id="PackageNumber" name="PackageNumber" value="" />
</form>
Every <hidden> has its value correctly sent when the form is submitted through this javascript command:
document.forms["hiddenform"].submit();
The form is submitted to an iframe:
<iframe id="iframe" name="iframe" onload="" style="display:block"></iframe>
When submitted, the iframe navigates to the page specified in the form's action attribute.
Everything works well, except for when the form is received. The page loads, but there is no post data, and the variables for post are not set.
Here is the code for SecretChunkUploader.php:
<?php
echo "Password: ".$_POST["Pass"]."<br/>";
echo "FileName: ".$_POST["FileName"]."<br/>";
echo "PackageNumber: ".$_POST["PackageNumber"]."<br/>";
echo "Bytes: ".$_POST["Bytes"];
?>
The loaded page from SecretChunkUploader.php looks like:
Password:
FileName:
PackageNumber:
Bytes:
I have tried testing isset() and it returned false for all of the post variables.
What on Earth am I doing wrong? I have tested and know that the form is fully working, it just doesn't pass the values onwards.
Thanks in advance for any help!
Instead of:
<hidden id="Bytes" name="Bytes" value="" />
Try:
<input type="hidden" id="Bytes" name="Bytes" value="" />
Same for all the others, of course.
I have a very simple app, it's only one php page (page A). I would like add one more php page (page B) that receives data from an html form of "page A". I haven't found any tutorials about it. Can you help me?
GET METHOD
Page A: (eg. index.html)
<form action="welcome.php" method="get">
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>
Page B (welcome php)
Welcome <?php echo $_GET["fname"]; ?>.<br />
You are <?php echo $_GET["age"]; ?> years old!
When to use method="get"?
When using method="get" in HTML forms, all variable names and values are displayed in the URL.
Note: This method should not be used when sending passwords or other sensitive information!
However, because the variables are displayed in the URL, it is possible to bookmark the page. This can be useful in some cases.
Note: The get method is not suitable for very large variable values. It should not be used with values exceeding 2000 characters.
POST METHOD
Page A: (eg. index.html)
<form action="welcome.php" method="post">
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>
Page B (welcome php)
Welcome <?php echo $_POST["fname"]; ?>!<br />
You are <?php echo $_POST["age"]; ?> years old.
When to use method="post"?
Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.
However, because the variables are not displayed in the URL, it is not possible to bookmark the page.
The PHP $_REQUEST Function
The PHP built-in $_REQUEST function contains the contents of both $_GET, $_POST, and $_COOKIE.
The $_REQUEST function can be used to collect form data sent with both the GET and POST methods.
Example
Welcome <?php echo $_REQUEST["fname"]; ?>!<br />
You are <?php echo $_REQUEST["age"]; ?> years old.
If you are using Form on Page A then you can post the values from that form to another page B.
if you are not using post or get you can still pass values from one page to another by creating session.
Html form can have action set to Page B and $_POST or $_GET can give you data from page A to Page B
You are best off looking into a few tutorials this is PHP 101.
You can store the data in a session or cookie.
You can use a form to POST data to the next page.
you can use GET to send data in the uri
Here is a tutorial for POST and GET
Edit : It sounds like you wish to pass the variables with a redirect. You could set the variables in session and retrieve them later or pass the variables in the redirect and fetch them using $_GET. Rather than redirecting to example.php redirect to example.php?var=value.
Why is it that when I pass parameters through encoded URL and GET method in HTML form, the URL encoded parameters are dropped?
e.g. Setup:
<form action="process.php?hello=world" method="GET">
<input type="text" name="foo" value="bar">
<input type="submit">
</form>
Result: the variable hello will not be recognized in process.php.
Is this bad practice?
Is this how PHP processes it, or is it related to how the browser send the request? Is there the same problem in other languages?
Yes, that is bad practice because it just doesn't work.
If you want to pass in "hidden form input" then you must use a hidden form element:
<input type="hidden" name="hello" value="world" />
As rezzif states in his comment, you can mix GET & POST like so:
<form action="/something?foo=bar" method="POST">
<input type="text" name="baz" />
</form>
As a general rule I avoid mixing the two though. I find it bizarre to have GET params in my form action.
I know it is php global variable but I'm not sure, what it do?
I also read from official php site, but did not understand.
You may want to read up on the basics of PHP. Try reading some starter tutorials.
$_POST is a variable used to grab data sent through a web form.
Here's a simple page describing $_POST and how to use it from W3Schools: PHP $_POST Function
Basically:
Use HTML like this on your first page:
<form action="submit.php" method="post">
Email: <input type="text" name="emailaddress" /> <input type="submit" value="Subscribe" />
</form>
Then on submit.php use something like this:
<?
echo "You subscribed with the email address:";
echo $_POST['emailaddress'];
?>
There are generally 2 ways of sending an HTTP request to a server:
GET
POST
Say you have a <form> on a page.
<form method="post">
<input type="text" name="yourName" />
<input type="submit" />
</form>
Notice the "method" attribute of the form is set to "post". So in the PHP script that receives this HTTP request, $_POST[ 'yourName' ] will have the value when this form is submitted.
If you had used the GET method in your form:
<form method="get">
<input type="text" name="yourName" />
<input type="submit" />
</form>
Then $_GET['yourName'] will have the value sent in by the form.
$_REQUEST['yourName'] contains all the variables that were posted, whether they were sent by GET or POST.
It's used to store CGI input via a POST sent to your page.
Example:
Your page contains:
<form action="welcome.php" method="post">
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>
One the user submits the values input into the form, you can access those variables through $_POST using the names you provided for the input tags.
Welcome <?php echo $_POST["fname"]; ?>!<br />
You are <?php echo $_POST["age"]; ?> years old.
You can capture post values from forms:
Example:
<form method="POST">
<input type="text" name="txtName" value="Test" />
</form>
To get this you'll use:
$_POST["txtName"];
It contains data sent by HTTP post, this is most often from a HTML FORM.
<form action="page.php" method="post">
<input type="text" name="email" ...>
...
</form>
Will be accessible by
$_POST["email"]
It contains the data submitted via the POST method, and only the POST method, versus data submitted via the GET method. The $_REQUEST superglobal variable contains both $_POST and $_GET data.
When data is posted through a form to the server, you access it through the $_POST array:
<form method="post">
<p><input type="text" name="firstname" /></p>
<p><input type="submit" /></p>
</form>
--
<?php
if ($_POST)
print $_POST["name"];
?>
Not all data is sent through $_POST through. File uploads are done through $_FILES.
As defined by the Hypertext Transfer Protocol specifications, there are several types of requests that a client (web browser) can make to a resource (web server).
The two most common types of web requests are GET and POST. PHP automatically loads any client request data into the global arrays, $_GET and $_POST, based on the type of web request received. The type of request is transparent to the user of the web browser, and is simply based on what is going on in the page. In general however, any regular link you click produces a GET request, and any form you submit produces as POST request.
If you click a link that goes to "http://example.com/index.php?x=123&y=789", then index.php will have it's $_GET array populated with $_GET['x'] = '123' and $_GET['y'] = '789'.
If you submit a form that has the following structure:
<form action="http://example.com/index.php" method="post">
<input type="text" name="x">
</form>
Then the receiving script, index.php, will have it's $_POST array populated with $_POST['x'] = 'whatever you typed into the textbox named x';
There are two ways of sending data from a form to a web app, GET and POST.
GET sends the data as part of the URL string: http://www.example.com/get.html?fred=1&sam=2 is an example of what that would look like. There are some problems with using it for all processing, one of the biggest is that every browser has a different maximum length for the query string, so you may have your data truncated.
POST sends them separately from the URL. You avoid the short length limit, plus you can send binary or encrypted data with POST.
In the first example above, PHP can retrieve the values sent by $_GET['fred'] and $_GET['sam']. You would use $_POST instead if the form was POSTed.
If you're wondering which method you should use, start here
$_POST is used to retrieve values passed to your page via a POST request.
For example, your page uses a form to pass data to another page in your application. Your form would have
<form method="post">
to pass those values via POST.
It is matched by $_GET which perform the same function for GET requests.
If you want to be able to reference either GET/POST values, you can use $_REQUEST
It contains any values posted from a HTML form to this script.