Validating Proper Postal Codes!
This function validates proper postal code formats for the United States of America, Canada, & United Kingdom.
- $city is the country code variable.
- $zip is postal code variable.
First lets start by starting hehe. We're going to make it into a function, define the function variables, trim the entered zipcode with the PHP function trim, then we'll add a php switch.
CODE
<?php
function pcv($city, $zipc){
$zipc = trim($zipc);
switch($city){
?>
Next we're going to check for each area. The US, CA, & UK using the ereg / regex functions.
CODE
<?php
case "us":
if (ereg("^[0-9]{5}$",$zipc) || ereg("(^[0-9]{5})-([0-9]{4}$)",$zipc) || ereg("(^[0-9]{5}) ([0-9]{4}$)",$zipc)){
return false;
} else {
return true;
}
case "ca":
if (ereg("^[a-zA-Z][0-9][a-zA-Z][[:space:]][0-9][a-zA-Z][0-9]$",$zipc)){
return false;
} else {
return true;
}
case "uk":
if (ereg("^[a-zA-Z]{2}[0-9]{1,2} [0-9][a-zA-Z]{2}+$",$zipc)){
return false;
} else {
return true;
}
default:
if (ereg("^[a-zA-Z0-9]+[a-zA-Z0-9- ]+[a-zA-Z0-9]$",$zipc) && (strlen($zipc) < 15)){
return false;
} else {
return true;
}
?>
Basically what this code above does is check for certain characters, such as numerials and letters. It detects where each number/letter is and put's it into each category. (US, CA, UK).
Here is an example of use:
CODE
<?php
if(pcv($city, $zipc){
echo "Error message, incorrect code";
} else {
echo "Correct message, good code";
}
?>
And here is our full code.
CODE
<?php
function pcv($city, $zipc){
$zipc = trim($zipc);
switch($city){
case "us":
if (ereg("^[0-9]{5}$",$zipc) || ereg("(^[0-9]{5})-([0-9]{4}$)",$zipc) || ereg("(^[0-9]{5}) ([0-9]{4}$)",$zipc)){
return false;
} else {
return true;
}
case "ca":
if (ereg("^[a-zA-Z][0-9][a-zA-Z][[:space:]][0-9][a-zA-Z][0-9]$",$zipc)){
return false;
} else {
return true;
}
case "uk":
if (ereg("^[a-zA-Z]{2}[0-9]{1,2} [0-9][a-zA-Z]{2}+$",$zipc)){
return false;
} else {
return true;
}
default:
if (ereg("^[a-zA-Z0-9]+[a-zA-Z0-9- ]+[a-zA-Z0-9]$",$zipc) && (strlen($zipc) < 15)){
return false;
} else {
return true;
}
}
?>
Saturday September 22, 2007 - 697 reads