Eliminate the Selected option if already selected in database...? - php

Question

I have a select box with options up to 20, for example, if option 5 or any other is selected and saved in a database in the specific column it won't show next time...
please guide me
<select class="form-control text-center" name="code" id="Code" >
<option value="">Select Code</option>
<?php for($i = 1; $i <= 20; $i++){ ?>
<option value="<?php echo $i; ?>"><?php echo $i; ?></option>
<?php } ?>
</select>

Answer 1

Controller:
function index(){
//below code should be in Model this is only for example
$this->db->select('code');
$query = $this->db->get_where('hr_levels', array('created_by' => $_SESSION['username']));
if ($query->num_rows() > 0) {
$code = $query->row('code');
} else {
$code = 0;
}
$option = array();
for($i=1;$i<=20;$i++){
if ($code != $i) {//no need to add if in view, just pass the data to view
$option[$i] = $i;
}
}
$data['options'] = $option;
$this->load->view('option_view',$data);
}
view:
<select class="form-control text-center" name="code" id="Code" >
<option value="">Select Code</option>
<?php foreach($options as $key => $value){
<option value="<?php echo $key; ?>"><?php echo $value; ?></option>
<?php } ?>
</select>

Answer 2

You can approach it like this
$availableOption = range(1,20);
$selectedOrInDb = [5,6,8,9]; // Selected OR from DB
$remaining = array_diff($availableOption, $selectedOrInDb);
Now you can use $remaining to loop through
<select class="form-control text-center" name="code" id="Code" >
<option value="">Select Code</option>
<?php foreach($remaining as $key => $value){ ?>
<option value="<?php echo $value; ?>"><?php echo $value; ?></option>
<?php } ?>
</select>

Answer 3

Controller
public function get_selected(){
$this->load->model('model_name');
$data['selected'] = $this->model_name->function_name($_SESSION['username']);
//Already saved values will be get on the basis of any condition
return $this->load->view('file.php');
}
Model
public function function_name($username){
return $this->db->get_where('table', ['created_by' => $username])->row()->value;
}
Now you get already selected value in $selected
<select class="form-control text-center" name="code" id="Code" >
<option value="">Select Code</option>
<?php for($i = 1; $i <= 20; $i++){
if($i != $selected)?>
<option value="<?php echo $i; ?>"><?php echo $i; ?></option>
<?php } } ?>
</select>