Form validation - Zero "0" not being accepted

[Eiolon]

I have a field that asks for a number.  Any number is being accepted except for zero.  It will accept double zeros but not a single zero.

 

Here is my validation:

 

if (empty($_POST['seats'])) {
$errors[] = 'Enter the number of seats available';
}

if (!ctype_digit($_POST['seats'])) {
$errors[] = 'The number of seats must be a digit';
}

if ($_POST['seats']) {
$s = escape_data($_POST['seats']);
}

 

My escape data function

 

function escape_data ($data) {
global $dbc;
if (ini_get('magic_quotes_gpc')) {
	$data = stripslashes($data);
}
return mysql_real_escape_string (htmlspecialchars(trim(strip_tags($data))), $dbc);
}

[salathe]

The string "0" is considered as empty (i.e. empty("0") returns TRUE).  In the first if statement you could either explicitly cater for "0" or use some other method to check on the string being really empty (e.g. strlen to check the length of the string [in bytes]).

[Eiolon]

Thank you!

[teamatomic]

Turn the data into a string with:

$num = "$_POST['num']"; // note the quotes

Then

if ($num != NULL)

later if you compare your string against an interger PHP will automatically treat the string as an integer.

 

 

HTH

Teamatomic

[salathe]

teamatomic, all $_POST values are strings anway (unless altered in your script) so that would be redundant (plus it's proper to use (string) to cast to a string value).