Speicific character in text field with PHP

PHP
1

Hi, I want to setup a form, and use a text field which requires a specific character init - I was first advised to use javascript but bots will be able to by pass that… I am looking to see if there is a php coding that can do this?

This is what I am trying to achieve - 4 + 1 =

<input name=“mathSum” type=“text” id=“mathSum” size=“1” maxlength=“1” />

The answer will of course be 5. I want to do the field so only 5 can be accepted.

If any body has any guidance in this topic that would be fantastic.

Cheers,

Paul

2

Assuming your posting the form:


if(!isset($_POST['mathSum']) || $_POST['mathSum']!=5) {
    die("That's the wrong answer, try again!");
}

This code checks to see if mathSum has been posted and if the value is 5. If not, it stops the script and tells the user it’s wrong.

3

Thanks for the reply. That didn’t work, the form I am posting is just an HTML form in a PHP document, nothing complex, extremely simple stuff.

4

Can you post the form and the part of the code where you validate the form?

5

Here is the form:

<form name="formcheck" action="/enquiry.php" onsubmit="return formCheck(this);">
	<table align="center" border="0" cellpadding="8" cellspacing="0" width="50%">
		<tr>
		  <td align="left">Name:</td>
		  <td colspan="2" align="left"><input name="Name" type="text" id="Name" size="14" /></td>	
		</tr>
		<tr>
		  <td align="left">Email:</td>
		  <td colspan="2" align="left"><input name="Email" type="text" id="Email" size="14" /></td>
		</tr>
		<tr>
		  <td align="left" valign="top">Enquiry:</td>
		  <td colspan="2" align="left" valign="top"><textarea name="Enquiry" id="Enquiry" style="width:105px;height:75px;" rows="" cols=""></textarea></td>
	    </tr>
		<tr>
		  <td align="left" valign="top">Security:</td>
			<td align="right" valign="top">1 + 4 = <input name="Security" type="text" id="Security" size="1" maxlength="1" /></td>
		</tr>
        <tr>
			<td colspan="3" class="center">
			<div align="right">
			<input type="submit" value="Submit" />		
			<input type="reset" value="Reset" />	
			</div></td>	
		</tr>
	</table>
</form>

I have chnaged the mathSum to security. The form validates in javascript, so I am thinking maybe I should just do that to keep it consistent.

6

Ah, you’re not POSTing the form, but GETting it.

In the example I gave, try changing $_POST to $_GET. It might work then.

7

Also, field named “Security”, not mathsum

8

I know, I changed it accordingly - I am probably going to go for a bit of javascript. It’s not something that is overly important :slight_smile: Thank you both for your help.