View Full Version : PHP Form Validation ???

25 May 2006, 04:48 AM
I wonder if anyone around could possibly enlighten me a little (or indeed, a LOT) towards "Contact Us" form validation in PHP.

Basically, I've created the form & then typed in the validation related codes from 3 different books along with differerent websites so far, but ONLY, if I understood it.

However, there are only couple things that's beyond me, which can be seen from the comment around the code that I didn't understand i.e. comment typed after "//"

Much of the code is still missing bearing in mind my expectation from this form and my lack of knowledge in how to go about doing it.

This is what I'm aiming for:

>> Users MUST fill in all the fields (including radio button field and drop-down menu field)
>> If they don't then they should get a message saying so
>> If they don't fill any certain field then they should get a message saying "Please fill in your E-mail" (for example) OR if they don't select appropriate "radio button" option or "drop-down" menu option then they should get an error message saying "please select the appropriate "Title" from the drop-down list", etc. OR "please choose the means of contacting you" (by choosing appropriate radio button)
>> The "blanked" or "incorrect data entry" field should turn to "red" making it easier for user to realise what's missing

>> After user fills everything & when they click "Preview" they should get some sort of "message" (ONLY if the data is valid and ALL required fields filled) saying "Following are the details you filled in" and then underneath it, CONFIRM their title, name, e-mail, telephone number, message, ways of contacting back to them, etc. (basically, ALL the field) with "Submit" and "Edit" button. Selecting "Edit" will take them back to the form, with all the data they filled in STILL there (rather than making the re-type everything)
>> If they simply click on submit (after filling the required & valid data) then they should get a message saying "Thanks for your message, we'll be in touch shortly".

The codes that I've created as yet are as follows:

<?php include("menu.inc");?>

<div id="centerContent">

<p class="first-letter">Please fill the following form in for any enquiries that you may have:</p>


// if the form has been posted, analyse it:
if ($_POST) {
foreach ($_POST as $field => $value) {
$value = trim($value);

// creating variables

// create empty error variable
$error = "";

// check for data in required fields
if (($inquiry == "") || ($title == "") || ($first_name == "") || ($last_name == "") || ($email == "") || ($phone == "") || ($message == "") || ($reply == "") || ($contact == "")) {
$error = "Please fill in all the required fields!";

// validate first_name
if ((ctype_alpha($first_name) == FALSE
$error = "Please enter a valid name (Alphabets only)<br/>";

// validate surname
if ((ctype_alpha($last_name) == FALSE {
$error = "Please enter a valid last name (Alphabets only)<br/>";

// validate e-mail
if ((strpos($email, "@") === FALSE ||
(strpos($email, ".") === FALSE ||
(strpos($email, " ") != FALSE || // DON'T KNOW WHY USING "!=" SIGN
(strpos($email, "@") === FALSE || // DON'T KNOW WHY USING 3 "=" SIGN
(strpos($email, "@") > strrpos($email, "."))) {
$error = "Please enter a valid e-mail address<br/>";

// validate phone
if (is_numeric($phone) == FALSE {
$error = "Please enter a valid contact number (must contain numbers only)<br/>";

//If everything is OK then Confirmation of each field's data as filled by the user
else {
echo "<p><b>Nature of Inquiry:</b> $inquiry<br/>";
echo "<p><b>Title:</b> $title<br/>";
echo "<p><b>First Name:</b> $first_name<br/>";
echo "<p><b>Last Name:</b> $last_name<br/>";
echo "<p><b>E-mail:</b> $email<br/>";
echo "<p><b>Contact No.:</b> $phone<br/>";
echo "<p><b>Message:</b> $message<br/>";
echo "<p><b>Reply:</b> $reply<br/>";
echo "<p><b>Contact Method:</b> $contact<br/>";

echo "Thanks for contacting us. We will get back to you shortly!";

<table class="table">

<tr class="tr">
<td class="td"><form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
Nature of Enquiry:</td>
<td class="td"><select name="inquiry" value="<?php echo $inquiry ?>">
<option>General Inquiry</option>
<option>Price Quotation</option>

<tr class="tr">
<td class="td">Title:</td>
<td class="td"><select name="title" value="<?php echo $title ?>">

<tr class="tr">
<td class="td">First Name:</td>
<td class="td"><input type="text" size="30" maxlength="30" name="first_name" value="<?php echo $first_name ?>"/></td>

<tr class="tr">
<td class="td">Last Name:</td>
<td class="td"><input type="text" size="30" maxlength="30" name="last_name" value="<?php echo $last_name ?>"/></td>

<tr class="tr">
<td class="td">E-mail:</td>
<td class="td"><input type="text" size="30" maxlength="30" name="email" value="<?php echo $email ?>"/></td>

<tr class="tr">
<td class="td">Contact No.:</td>
<td class="td"><input type="text" size="30" maxlength="20" name="phone" value="<?php echo $phone ?>"/></td>

<tr class="tr">
<td class="td">Message:</td>
<td class="td"><textarea rows="10" cols="50" wrap="physical" name="message" value="<?php echo $message ?>">

<tr class="tr">
<td class="td">Reply Required:</td>
<td class="td"><input type="radio" name="reply" value="<?php echo $reply ?>"/>Yes
<input name="reply" type="radio"/>No
<input name="reply" type="radio"/>Maybe</td>

<tr class="tr">
<td class="td">How would you like to be contacted (if required)?<br/><br/></td>
<td class="td"><input type="radio" name="contact" value="<?php echo $contact ?>"/>E-mail
<input type="radio" name="contact"/>Telephone</td>

<tr class="tr">
<td class="td"></td>
<td class="td"><input type="reset" name="reset" value="Reset"/>
<input type="preview" name="preview" value="Preview"/></td>
<input type="submit" name="submit" value="Submit"/></td>

25 May 2006, 05:17 AM
!= means 'does not equal' and === means 'is identical to'.

For some of the form validation, why not consider using some Javascript?