[snip]
> [stuff you may not need]
> This is a boiled down version of a longer function that counts string
> lengths to determine how many dashes might need to be added. Let's say
> you have the area code in the number, like 2108765432. Being a ten
digit
> number with a recognizable area code we can then add a portion to the
> function to add the two needed dashes, making the number more
readable.
> [/stuff]
I'd love to see that larger function, if you care to share.
[/snip]
Here is a little more of the larger function with comments (more
comments than code, which is never a Bad Thing [tm]). I am only showing
the handling for two basic types of telephone numbers with explanation
for additional verification which we would typically use, since we have
those resources available.
<?php
/*
** Dashing Through The TN's
** addTNDashes.func
**
*/
function addTNDashes($originalTN){
/*
** get the length of the number passed
** you could also make sure that the string is numeric here
** and throw an appropriate error if not
*/
$lengthTN = strlen($originalTN);
/*
** in this example we are going to examine two basic types of
** phone numbers, the seven digit and the ten digit
** you can add other conditions for other standard formats of
** world wide TNs
*/
if(7 == $lengthTN){
/*
** here we dash our seven digit number
** we could also validate the first three numbers as
** a valid NXX (exchange) if we had a list or DB of NXXs
*/
$newTN = substr($originalTN, 0, 3) . "-" .
substr($originalTN, 3, 4);
} elseif(10 == $lengthTN){
/*
** here we dash our ten digit number
** we could also validate the first three numbers as
** a valid NPA (area code) if we had a list or DB of
NPAs
*/
$newTN = substr($originalTN, 0, 3) . "-" .
substr($originalTN, 3, 3) . "-" . substr($originalTN, 6, 4);
} elseif(7 < $lengthTN){
/*
** the number is way too short to be a phone number
** let's throw an error and exit
** don't forget to set up some sort of error-logging for
this kind
** of thing for all of your errors
*/
echo "The number you have supplied to the application
does not appear to be\n";
echo "the correct format for any known telephone number.
Please correct this\n";
echo "and restart application.\n";
$appLog = fopen("application_error.log", "a");
/* do error logging as you wish, dates, times, user ids,
etc */
fclose($appLog);
exit();
}
return $newTN;
}
?>
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