[SOLVED] Number Validation

[dfowler]

Hey guys, I have a form that I need help validating.  The only options the form field can have are either numbers or empty.  I've tried

 

is_numeric($value);

 

but that doesn't help if the field is left empty.  I also tried

 

$number_format = "([0-9]{0,2})";

 

but had the same results.  I would greatly appreciate any help. 

[The Little Guy]

<?php
$value = trim($value);
if(is_numeric($value)||empty($value)){
     //field is good
}else{
     //field is bad
}
?>

[dfowler]

That still doesn't seem to work.  Do you think I could set the $number_format to letters and characters and then through the error if the field is like the format?

[The Little Guy]

Maybe something like this:

 

<?php
$value = trim($value);
if(is_numeric($value)){
     $good = TRUE;
}elseif(empty($value)){
     $good = TRUE;
}else{
     $good = FALSE;
}

if($good){
     //Field was good
}else{
     //Field was bad
}
?>

[revraz]

ctype works good too.

[dfowler]

Thanks Little Guy, that worked.  I changed the error to the following, thanks for you help.  I don't know why it was being so tricky.

 

		if(!$good) {
		echo "<tr>
				<td colspan='4'><h1>Your input is invalid, please go back and correct this.</h1></td>
			</tr>
			<tr>
				<td><a href='javascript:history.go(-1)' title='fix'>Go back</a></td>
			</tr>
			</table>";
		include 'footer.php';
		exit();
	}