26997 total geeks with 3514 solutions
Recent challengers:
 Welcome, you are an anonymous user! [register] [login] Get a yourname@osix.net email address 

Articles

GEEK

User's box
Username:
Password:

Forgot password?
New account

Shoutbox
timsattemme
[b][url=http ://www.lvlux uryoutlet.co m/]louis vuit<strong> <a href="http:/ /www.lvluxur youtlet.com/ ">louis vuitton outlet online</a></ strong> <br> <strong><a href="http:/ /www.lvluxur youtlet.com/ ">louis vuitton store</a></s trong> <br>
timsattemme
[b][url=http ://www.cheap -swisswatche s.com/]swiss <strong><a href="http:/ /www.cheap-s wisswatches. com/">swiss replica watches</a>< /strong> <br > <strong><a href="http:/ /www.cheap-s wisswatches. com/">replic a watches</a>< /strong> <br >
timsattemme
<ul><li><str ong><a href="http:/ /www.cheap-s wisswatches. com/">best replica watches site</a></st rong> </li>< li><strong>< a href="http:/ /www.cheap-s wisswatches. com/">swiss Mechanical movement replica watches</a>< /strong> </l i><li><stron g><a href="http:/ /www.c
timsattemme
<strong><a href="http:/ /www.1nate.n et/">lv bag charms</a></ strong> <br> <strong><a href="http:/ /www.1nate.n et/">lv outlet store</a></s trong> <br> <strong><a href="http:/ /www.1nate.n et/">louis vuitton outlet</a></ strong> <br> <br> <title>Noefu ll MM - $22
timsattemme
[b][url=http ://www.maxun dmoritz-show .com/womens- nfl-jerseys- c-21.ht<stro ng><a href="http:/ /www.maxundm oritz-show.c om/womens-nf l-jerseys-c- 21.html">Wom en's NFL Jerseys</a>< /strong> <br > <strong><a href="http:/ /www.maxundm oritz-show.c om/womens-nf l-jerseys-c

Donate
Donate and help us fund new challenges
Donate!
Due Date: Sep 30
September Goal: $40.00
Gross: $0.00
Net Balance: $0.00
Left to go: $40.00
Contributors


News Feeds
The Register
Rubish WPS config
sees WiFi router
keys popped in
seconds
Virgin Media blocks
"wankers" from
permissable
passwords
Hot students,
"liquid coolant",
bagpipes and
Brazilians: It"s a
cluster compo,
folks
European Commission
okays Oracle"s
MICROS gobble
Broadcom reveals
$20 "Pi in the sky"
IoT development
widget
Yahoo!
YUI!
project!
is!
no!
more!
Facebook, Google
and Instagram
"worse than drugs"
says Miley Cyrus
Drone-maker slapped
for illegal exports
Redmond holds out
on e-mail handover
order
Hardkernel nixes
RPi clone project
Slashdot
Apple Said To Team
With Visa,
MasterCard On
iPhone Wallet
Grand Ayatollah
Says High Speed
Internet Is
"Against Moral
Standards"
XKCD Author"s
Unpublished Book
Remains a
Best-Seller For 5
Months
Yahoo Stops New
Development On YUI
The Apache Software
Foundation Now
Accepting BitCoin
For Donations
DNA Reveals History
of Vanished
"Paleo-Eskimos"
Feds Want Nuclear
Waste Train, But
Don"t Know Where It
Would Go
Ukraine Asks
Zuckerberg to
Discipline Kremlin
Facebook Bots
Update: Raspberry
Pi-Compatible
Development Board
Cancelled
Feynman Lectures
Released Free
Online
Article viewer

PHP Form Field Data Validation Example/Tutorial



Written by:dimport
Published by:SAJChurchey
Published on:2003-06-21 07:19:46
Topic:PHP
Search OSI about PHP.More articles by dimport.
 viewed 45358 times send this article printer friendly

Digg this!
    Rate this article :
This is a simple script to illustrate the of a function, field_validator(), which I modified from an original piece of code submitted on the devshed forums.

The field_validator() function is an extremely useful function for validating simple data that is returned to your PHP script from an HTML form. By using the function you can validate that the data a user enters on a form is of the correct type (i.e. email, string, digit, number, alpha, alphanumeric) and that it is of the
correct length (i.e. > min length).

The function is as follows:

function field_validator($field_descr, $field_data, $field_type, $min_length="", $max_length="", $field_required=1) {
    # array for storing error messages
    global $messages;
    
    # first, if no data and field is not required, just return now:
    if(!$field_data && !$field_required){ return; }
     # initialize a flag variable - used to flag whether data is valid or not
    $field_ok=false;
     # this is the regexp for email validation:
    $email_regexp="^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|"
    $email_regexp.="(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$";
     # a hash array of "types of data" pointing to "regexps" used to validate the data:
    $data_types=array(
        "email"=>$email_regexp,
        "digit"=>"^[0-9]$",
        "number"=>"^[0-9]+$",
        "alpha"=>"^[a-zA-Z]+$",
        "alpha_space"=>"^[a-zA-Z ]+$",
        "alphanumeric"=>"^[a-zA-Z0-9]+$",
        "alphanumeric_space"=>"^[a-zA-Z0-9 ]+$",
        "string"=>""
    );
    
    # check for required fields
    if ($field_required && empty($field_data)) {
        $messages[] = "$field_descr is a required field.";
        return;
    }
    
    # if field type is a string, no need to check regexp:
    if ($field_type == "string") {
        $field_ok = true;
    } else {
        # Check the field data against the regexp pattern:
        $field_ok = ereg($data_types[$field_type], $field_data);
    }
    
    # if field data is bad, add message:
    if (!$field_ok) {
        $messages[] = "Please enter a valid $field_descr.";
        return;
    }
    
    # field data min length checking:
    if ($field_ok && $min_length) {
        if (strlen($field_data) $max_length) {
            $messages[] = "$field_descr is invalid, it should be less than $max_length characters.";
            return;
        }
    }
}


This article was originally written by munk

Did you like this article? There are hundreds more.

Comments:
Anonymous
2008-03-11 17:53:17
Looks like the script is missing the ; after $email_regexp="^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|"

Also, add a > in the max length comparison
if (strlen($field_data) > $max_length) {
Anonymous
2009-01-01 18:09:37
okay
Anonymous
2009-07-13 16:24:53
Great tutorial! I have added this to my new famous logos blog. You can see a list of famous company logo designs there too,
Anonymous
2010-01-20 07:37:58
12115
Anonymous
2010-02-12 19:41:41
fffff
Anonymous
2010-02-14 04:09:48
Excellent. Thanks a ton.
Anonymous
2010-03-12 19:44:40
When do you invoke this function?
Anonymous
2010-03-17 05:46:54
the code is good. For someone that doesn't know much about how to implement this into a form; they'll have trouble though.

- James
<a href="http://www.fendza.com">Employee Scheduling Software by Fendza.com</a>
Anonymous
2010-03-17 05:50:26
Forgot to add; may want to add in there a quick how-to on how to not only implement, but also convert it to fit different forms by where to input the id tags.

James
Employee scheduling software by Fendza
Anonymous
2011-02-02 20:38:47
Daily Deals
Anonymous
2011-06-07 16:53:03
nu stiu de astea!!
ObatAsamUrat
2011-06-16 07:15:02
Exceptional blog site in this article! Moreover your internet internet site tons way up rapidly! Precisely what number do you think you're the application of? Am i allowed to are taking your internet marketer url on your number? I need our web page crammed as speedily while your own house : )
obat asam urat
Anonymously add a comment: (or register here)
(registration is really fast and we send you no spam)
BB Code is enabled.
Captcha Number:


Blogs: (People who have posted blogs on this subject..)
elasolova
My PHP Projects on Sat 26th Sep 10am
I have been developing PHP applications for almost a year now. I have developed three projects. One is a simple trivia game. The other is a question-answer based community at http://www.javaist.com/quans . The last one is a programming challenge site just
countll
Blog entry for Thu 25th Oct 7am on Thu 25th Oct 7am
soo nu on this wicked world of NET. just decided to dive in today..hope friend aroun here can help

Test Yourself: (why not try testing your skill on this subject? Clicking the link will start the test.)
Test of experience (hopefully) by AcidIce

Things you're only likely to know if you've actually written a lot of PHP before :)


     
Your Ad Here
 
Copyright Open Source Institute, 2006