Re: substr?

Thanks, I don't know *what* I was thinking.... The if statement still returns false though... // Validate cell if we have one. if (!$_POST['NumC'] == "") { if ((substr($_POST['NumC'], 0, 3) != "082") OR (substr($_POST['NumC'], 0, 3) != "072") OR (substr($_POST['NumC'], 0, 3) != "083") OR (substr($_POST['NumC'], 0, 3) != "073") OR (substr($_POST['NumC'], 0, 3) != "084")) { Any number passes. For example, if I have 123 as the first three chars, it passes... I fail to see how it manages this?? ----- Original Message ----- From: "Lazor, Ed" <ELazor@providence.org> To: "'Chris Knipe'" <savage@savage.za.org>; <php-general@lists.php.net> Sent: Monday, June 17, 2002 7:24 PM Subject: RE: [PHP] substr? > > > > -----Original Message----- > > Is this right? It seems to me that substr is working in reverse? > > Reverse... that's what the -7 specifies. > > substr($string, 0, -7) > > is > > 123 > > You could also do > > substr($string, 0, 3) > > to get the same thing. > > > > > > $string = "1234567890"; // Always numerical, always 10 chars. > > if (!substr($string, 0, -7) == "083") { > > echo "not 083\n"; > > } else { > > // Exists here. > > echo "is 083\n"; > > } > > > > Due to the reverse if, shouldn't it exit not 083? I'd just like > > to get some clarity on this, allot of my work depends on > > validating these > > numbers *correctly*.... Basically, I want to see if the first three > > characters is 072, 073, 082, 083, or 084. If not, the $string must be > > discarded. > > > > I've also tried if(substr($string, 0, -7) != "083"), but that > > also doesn't > > work.... ereg(*) also doesn't seem to be able to search for > > patterns only on > > the beginning of a string, so even if I wanted to use a ereg > > expression, I'd > > have to cut the first 3 chars from the string with substr first? > > > > How can / should I validate these numbers? > > > > > > > > > > > > -- > > PHP General Mailing List (http://www.php.net/) > > To unsubscribe, visit: http://www.php.net/unsub.php > > > > **************************************************************************** > This message is intended for the sole use of the individual and entity to > whom it is addressed, and may contain information that is privileged, > confidential and exempt from disclosure under applicable law. If you are > not the intended addressee, nor authorized to receive for the intended > addressee, you are hereby notified that you may not use, copy, disclose or > distribute to anyone the message or any information contained in the > message. If you have received this message in error, please immediately > advise the sender by reply email and delete the message. Thank you very > much. > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >