# Gravity Forms Zip Code Validation \[RESOLVED\]
**URL:** https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843
**Category:** Get Help
**Tags:** gform\_field\_validation, zip-code
**Created:** [May 13, 2019, 10:58pm UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843 "2019-05-13T22:58:18Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@dorys](https://community.gravityforms.com/u/dorys)
#### Post date: [May 13, 2019, 10:58pm UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843/1 "2019-05-13T22:58:18Z")
Hello,
I’m using the gform\_field\_validation to verify the applicant is in the correct zip code before moving on. I enter a valid zip code but I still get the invalid message.
Form can be seen [here](https://www.nextstepservicedogs.org/service-dog-application/).
This is my code
```auto
//GRAVITY FORMS ZIP CODE AUTHENTICATION
add_filter( 'gform_field_validation_15_193', 'custom_zip_validation', 10, 4 );
function custom_zip_validation( $result, $value, $form, $field ) {
if ( $result['is_valid'] ) {
$acceptable_zips = array(
'91901',
'91976',
'92040',
'92085',
'92123',
'92160',
'91902',
'91977',
'83687',
'83709',
'83720',
'83756',
'83631',
'83652',
'83701',
'83711',
'83722',
'83799',
'83301',
'83302',
'83303',
'83647'
);
if ( ! in_array( $zip_value, $acceptable_zips ) ) {
$result['is_valid'] = false;
$result['message'] = 'Zip validation failed. Unfortunately, we are not able to assist you. We currently serve the areas within an hour San Diego County, Santa Ana, California; and Boise, Idaho. Please visit the Assistance Dogs International (ADI) website for more information on service dog training. https://www.assistancedogsinternational.org/
';
}
}
return $result;
}
```
---
### Author:  [@chrishajer](https://community.gravityforms.com/u/chrishajer)
#### Post date: [May 14, 2019, 2:19am UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843/2 "2019-05-14T02:19:13Z")
You’re not assigning the information submitted in field 193 (the ZIP code) to `$zip_value` anywhere. So you are trying to see if `$zip_value` is in your `$acceptable_zips` array, but $zip\_value would be undefined at that point. With WP\_DEBUG or PHP warnings enabled you would see this notice.
You need something like this around line 31 (after `$acceptable_zips` is defined):
`$zip_value = rgar( $value, '193' );`
---
### Author:  [@dorys](https://community.gravityforms.com/u/dorys)
#### Post date: [May 14, 2019, 11:53am UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843/3 "2019-05-14T11:53:42Z")
Ah… I had removed that line from the original code because I know enough about php coding to get me into trouble. :-). I will add it back with the correct value. Thank you so much!!!
---
### Author:  [@dorys](https://community.gravityforms.com/u/dorys)
#### Post date: [May 14, 2019, 12:23pm UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843/4 "2019-05-14T12:23:57Z")
I added the line of code but it didn’t fix the issue. However, I did fix this by changing the field type from single line of text to address and showing only the zip code and then adding this line of code
```
$zip_value = rgar( $value, $field->id . '.5' );
```
This solved the issue and it’s working now.
---
### Author:  [@chrishajer](https://community.gravityforms.com/u/chrishajer)
#### Post date: [May 14, 2019, 4:43pm UTC](https://community.gravityforms.com/t/gravity-forms-zip-code-validation-resolved/1843/5 "2019-05-14T16:43:57Z")