Validation for duplicated on form

Hi i have a form with 20 serial number (serial_1 , serial_2 etc) , can i check with custom  validation if there are duplicate in form ?

If you create an array of your serial numbers like serial[1], serial[2] etc. you can use the array_unique function to remove any duplicates from this array. Then count the number of items in the original array and compare it to the number of items in the array_unique array. If it differs, you know there were duplicates

If you create an array of your serial numbers like serial[1], serial[2] etc. you can use the array_unique function to remove any duplicates from this array. Then count the number of items in the original array and compare it to the number of items in the array_unique array. If it differs, you know there were duplicates

Sorry but only serial_1 is required...

Then I don’t understand your question. What do you want to check for duplicates?
Validation of serial_1 is a simple validation. Checking all serials for a duplicate value is what I gave a suggestion for.

Then I don’t understand your question. What do you want to check for duplicates?
Validation of serial_1 is a simple validation. Checking all serials for a duplicate value is what I gave a suggestion for.

Yes , i want control if there are a duplicate in one or more serial.... I can do it by js but i want also server side

array_unique is a php function. A custom rule like this will probably work:
See: https://codeigniter4.github.io/userguide...stom-rules

PHP Code:

<?php

class MyRules
{
    public function duplicates($serialarray): bool
    {
$originalLength = count($serialArray);
$duplicateArray = array_unique($serialArray);
$duplicateLength = count($duplicateArray); 
if ($originalLength <> $duplicateLength){
return 0;
}else{
return 1;
    }
} 


array_unique is a php function. A custom rule like this will probably work:
See: https://codeigniter4.github.io/userguide...stom-rules

PHP Code:

<?php

class MyRules
{
    public function duplicates($serialarray): bool
    {
$originalLength = count($serialArray);
$duplicateArray = array_unique($serialArray);
$duplicateLength = count($duplicateArray); 
if ($originalLength <> $duplicateLength){
return 0;
}else{
return 1;
    }
} 


How can i pass in validation the array with every serial of form ?

See https://codeigniter.com/user_guide/libra...array-data