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Doc Bug #49703 The function returns false if the string is '0'
Submitted: 2009-09-28 21:14 UTC Modified: 2009-09-29 06:55 UTC
From: tech at sqlsurgeon dot com Assigned:
Status: Not a bug Package: Documentation problem
PHP Version: 5.3.0 OS: Redhad
Private report: No CVE-ID: None
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 [2009-09-28 21:14 UTC] tech at sqlsurgeon dot com 
Description:
------------
The function returns false if the string is '0'.

Reproduce code:
---------------
---
From manual page: function.ctype-digit#Notes
---

$tripSpace = '0';
		if(empty($tripSpace)||!ctype_digit($tripSpace)){
				$error = true;
				echo "<p>TripSpace is $tripSpace</p>";
				$posSpaceClass = "inValidField";
			}

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 [2009-09-29 06:55 UTC] torben@php.net 
The problem with your code is not in ctype_digit(), but in your test for empty($tripSpace). '0' evaluates as FALSE; ergo, your test fails, and your if() block executes. If you test ctype_digit('0');, you will find that the result is in fact boolean TRUE.
 
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