Preventing Form Validation Callback Issues Codeigniter - php

Question

this is my form_validation.php
$config = array(
'buy' =>array(
array(
'field' => 'id',
'label' => 'Item',
'rules' => 'trim|required'
),
array(
'field' => 'qty',
'label' => 'Quantity',
'rules' => 'trim|greater_than[0]|callback_validate_qty'
)
)
);
My Controller to load form validation :
$this->load->library('form_validation');
Function validate_qty($qty)
$item_id = $this->input->post('id');
$total_item= $this->item_model->getTotalItem($item_id);
if ($qty >= $total_item) {
$this->form_validation->set_message('validate_qty', 'Cant Buy More than maximum stock!');
return FALSE;
}
this validation is work perfectly, but someone has got throught it, he buy more than maximum stock..
How to prevent this? I don't know how he does that, but it looks like the validation didn't work for him. When I tested, it works perfectly, I don't know what's wrong with it, maybe he uses software or anything? is there any solution? Thanks

Answer 1

i think your code is correct.
i have one doubt on that code.
check the variable you used in if condition is correct or not ($qty). becuase you not show the full code.i don't known how that variable comes.
Also change the code like if and else condition.
if ($qty >= $total_item) {
$this->form_validation->set_message('validate_qty', 'Cant Buy More than maximum stock!');
return false;
} else {
return true;
}

Answer 2

Assume if you have 30 stock in your hand and you want to get all 30 stocks out. But according to your if condition (if ($qty >= $total_item) {) it throws error.
Fix 1
if should be > (if ($qty > $total_item) {).
Fix 2
Typo - in your callback function you've used two underscores _. Get rid of one
callback__validate_qty
^^
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