Hello,
I want to know how to pass variables from a form to a php page.
Thanks.
Edit:
I have some input and a submit button in a form. I want my php page to search the database and display a relevant table after I click the submit button. And all the actions here are in one page.
So I want to know how to pass variables from a form to a php script on the same page. I'm sorry for leaving so little detail.
Can you understand my question now? Thanks again.
That's easy, just comment them out:
$a = 'variable 1';
//$b = 'variable 2';
$c = 'variable 2';
You see? I assigned $a, then I passed right over $b, and finally assigned $c. All inside one PHP page!!
EDIT: This is how you pass a user entered value from a form to a PHP page.
Here is a generic form:
<form method="post" action="<?php echo $_SERVER['$PHP_SELF'];?>">
<input type="text" size="12" maxlength="12" name="name">
...
...
</form>
Now for the PHP code:
<?php
$name = $_POST["name"];
?>
Note: you can change the post type between POST and GET and change the action option to send the form input to a different PHP page.
Are you talking about passing a variable to a function?
$name = 'Robert';
printName($name);
function printName($n) {
echo $n;
}
<?php
$value = 'bla';
function getValue($string)
{
return ($_GET[$string]);
}
$value = getValue('bla');
?>
<html>
//...
<body>
<form>
<input type="text" value="<?php echo $value; ?>" />
</form>
<tr>
<td>
<tr><?php echo $value; ?></tr>
<td>
</body>
</html>
It is totally unimportant which order you use. You can put the html part into a PHP String with PHP variables inside, and echo it, php will automatically assign the vars inside. Or you seperate HTML and PHP as seen above.
Try to work with template engines, e.g. SMARTY (smarty.com)
All form variables end up in the $_POST or $_GET superglobal array (depending on the form method). If your script both displays the form and processes it, a standard method goes something like this:
if(isset($_POST['submit'])){
//validate $_POST variables from form
//if validation works do action
//else output errors and output form again
} else {
//output form
}
GET it from the URL
The quickest (but most limited) way to transfer variables is by a method called GET. With GET, you append the variables onto the URL of the page you want the variables to be transferred to:
http://www.matthom.com/contact.php?id=301&name=Matthom
The example above would give the contact.php page two variables to utilize: id, and name, whose values are 301, and Matthom, respectively.
You can add as many variables to the URL as you’d like.
Beware – sometimes you don’t want your variables to be shown "out in the open." Also, you are limited to 255 characters in the URL, so the variables can’t contain too much information.
From contact.php, you can GET these two variables via PHP:
GRAB THE VARIABLES FROM THE URL
$id = $_GET['id'];
$name =$_GET['name'];
POST it from a FORM
Another way to transfer variables, and by far the more robust way, is to grab them from a form.
Let’s say this is your form field code:
<form action="process.php" method="post">
<input type="text" size="25" name="searchtype" />
<input type="text" size="25" name="searchterm" />
</form>
These two input boxes allow users to enter information. At process.php, you can grab the variables in the same way:
GRAB THE VARIABLES FROM THE FORM
$searchtype = $_POST['searchtype'];
$searchterm = $_POST['searchterm'];
Notice the use of $_POST[] over $_GET[]. This is an important distinction.