CiviCRM Community Forums (archive)

hi all,

how can i set / implementations a hook for custom field

i have a custom field which id 11, this is a little for my code. i see error caused the variable $custom_fields ,

will anyone , what must to i do to solved this one, i have readed http://wiki.civicrm.org/confluence/display/CRMDOC40/CiviCRM+hook+specification#CiviCRMhookspecification-hookcivicrmvalidate

but for me it look like hard to understanding

function mymodule_civicrm_validate( $formName, &$fields, &$files, &$form ) {
    // sample implementation
    $errors = array( );
    if ( $formName == 'CRM_Contact_Form_Contact' ) {
       // ensure that external identifier is present and valid
       $custom_fields = CRM_Utils_Array::value( 'custom_11_-1'$custom_fields );
       if ( ! $externalID ) {
          $errors['custom_11_-1'] = ts( 'External Identifier is a required field' );
       } else if ( ! myCustomValidatorFunction( $externalID ) ) {
          $errors['custom_11_-1'] = ts( 'External Identifier is not valid' );
       }
    }
    return empty( $errors ) ? true : $errors;
 
}


thanks for help