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post more value in href tag

#1
I want to pass my dropdown value to the controller .

when i click this add button only one value can pass.


<a href="'.site_url("").'User/addsubjects/'.$row['subcode'].'" class="btn btn-info">Add</a> </td>';


can i able to pass two values (dropdown ,subcode) values to the controller
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#2
Drop-down is browser side, so while technically you can add more attributes to URL, and your Controller can pick these up, you would either had to build a JS script that appends to href value, or you would have to change A tag to a Form submission:

Code:
<from action="<?= site_url("").'User/addsubjects/'.$row['subcode'] ?>" method="POST">
<select name="dropdown">...</select>
<input type="text" name="subcode">
<button>Add</button>

PHP Code:
// Controller
public function addsubject()
{
 
   $dropdown $this->input->post('dropdown');
 
   $subcode $this->input->post('subcode');



Also, a quick note, to make code more readable, you should add all URL attributes inside site_url function like this
PHP Code:
site_url('User/addsubjects/'.$row['subcode']); 

Both ways technically work, but this is tidier and intended way.
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