how to gwhow to validate php form

1. Processing HTML FORM
Author:- Subhasis
CMC

2. The form code looks as like below

3. Output of the code will be

4. html form tags
Form Tags Output
<input type = "text" name = "name"/>
<input type="radio" name ="gender" value ="m“/>
<input type="CHECKBOX" name="age" value ="Y" checked/>
<SELECT name = "education">
<option selected value=“pg">P.Graduate</option>
</SELECT>
<input type="submit" name="submit" value="submit">
<TEXTAREA name = "aboutu" rows ="5" cols ="28"
></TEXTAREA>

5. Main form tag
• Method =“post” – This is the way of processing our user
filled data into the form. Instead of „POST‟ we can use
„GET‟.
• GET – when we use get method the data processed will
be visible. The amount of data is to be sent is limited
• POST – when we use POST method the data processed
will be not visible. The amount of data is to be sent is not
limited.

6. Continue
• When we process the form the html sends the data to file which is in
action tag. Here when the form will process it will sends to
“formfill.php”.
• We need some php code to get those values which will be sent by the
form tag .
• We have three types.
▫ $_GET = we used to get the values from html form when method is get
▫ $_POST = we used to get the values from html form when method is
post
▫ $_REUQEST = it works on both .

7. PHP code to get the form values
• In PHP the $_GET,$_POST & $_REQUEST are
special array in PHP.
• It collect the information which filed has collected
the values .
• Simply there is no value about the fields on which
there is no values entered by the user.
• To check that use the step by step tutorial. I will use
$_POST for this what ever you want you can refer
else you can refer what I am referring.

8. Checking the Special array $_POST
• Step -1 :- write the html file with form as below.
Next step is to write a
php code for processing,
the name will be in
action tag as below. Here
my php file name is
“test.php”.
Let‟s write that

9. Continue ….
• Step – 2 :- writing the php file “test.php”

10. What is $_POST,$_GET & $_REQUEST ?
• There are three special global arrays in PHP.
▫ $_POST
▫ $_GET
▫ $_REQUEST
• When ever you submit any data to get those
value you can use any one of the above array.
• $_POST is more robust than $_GET,
$_REQUEST is combined both of them.

11. Cont’d……
• $_GET is not secured .
• $_GET is not capable to send large amount of
data
• $_POST is secured and able to send unlimited
amount of data.
• So $_POST is more preferable.

12. Let’s receive data sent by HTML form
• To fetch the data from form we have to specify
name for each element of the form.
• Once you do that any data you will send from
FORM it will be fetch by the special array
$_GET & $_POST.
• To reuse it you can store it to some variable and
do what ever else you want to do.

13. An example(form code)

14. PHP code to process

15. Form validation