Validation A Phone Number When Submitting A Form

[webguync]

I am trying to validate a phone number when submitting a form. The code I am using to validate is

 

/* Phone Number Validation */
if(!mb_eregi("/[0-9]/","-",$phone))
$this->setError('phone', 'invalid phone number');
elseif(mb_strlen(trim($phone)) > 12)
$this->setError('phone', 'too long! 12 characters');

 

I want the format to be 123-123-1234

 

I get an invalid phone number display when I test and enter the phone number in that format. I must have something wrong. The phone name is set right and the variable $phone is right. Anything else to check?

[Zane]

Unless you are still using PHP4, there is no need to use the POSIX regular expression engine. ..aka ereg. You are much better off using PCRE aka... preg to validate. I especially do not understand the use of the multibyte function mainly because I have never used it myself... and I have been able to validate phone numbers just fine without it

 

Something like this should work just fine for a phone number

if(preg_match("#[0-9{3}-[0-9]{3}-[0-9]{4}#", $phoneNumber)) echo "valid phone number"

 

Although it isnt the most common and popular way of doing, it should get you on the right track.

Edited October 23, 2012 by Zane

[ManiacDan]

You should probably anchor your exp<b></b>ression (and end statements with a semicolon), but otherwise Zane is right:

 

if(preg_match("#^[0-9]{3}-[0-9]{3}-[0-9]{4}$#", $phoneNumber)) echo "valid phone number";

Edited October 23, 2012 by ManiacDan

[Christian F.]

Add a closing square bracket before the first quantifier, and we're all in agreement.