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Topic |
How to get values of variables from outside PHP?
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Explanation |
Consider a simple form which contains a username, email address and a submit button.
When the user fill the form and click submit button the form will be submitted. When a form is submitted to a PHP script,
the information from that form is automatically made available to script mentioned in form action part.
Coding to create a simple form
<form action="variable.php" method="post">
Name: <input type="text" name="name">
Email: <input type="text" name="mail">
<input type="submit" value="Submit">
</form>
Here when submit button is clicked, the form data will be send to variable.php file because this is the file name mentioned in the
form action part. If u want to submit form data to the same page then you have to mention either action="$PHP_SELF" or action="".
<form method="post" action="<php echo $PHP_SELF; ?>">
</form>
When any other file name is specified in the action part then the form data will be available to that file.
By this we mean that the form data will be made available to the same file in which form is present or to any other file by specifying the file name in action part.
There are two ways to access the form variables, They are POST and GET method.In the above code we have used POST method
to the get the form data.
Form is submitted when the user clicks the "Submit" button, when POST method is used the URL will not contain any form data,
the URL will be passed as such. Here URL will be
http://www.hscripts.com/tutorials/php/variable.php
When GET method is used then the form data is passed through the URL ie, URL will contain form data.
http://www.hscripts.com/tutorials/php/variable.php?name=admin&mail=ad@hiox.com
There are many ways to access data from your HTML forms. Some examples are listed below.
HTTP POST variables: $_POST
HTTP GET variables: $_GET
HTTP File upload variables: $_FILES
Request variables: $_REQUEST
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