Handling data from select option form in PHP [closed] - php

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I have basic login form :
....
<input type="text" required autocomplete="off" name="user_name"/>
<input type="password" required autocomplete="off" name="password"/>
....
But I want user choose username from section option instead of input username from keyboard. So I make a select option form
<div class="col-md-2">
<select name="Grade" id="Grade"
data-live-search="true" class="chosen selectpicker form-control" required>
<option value="">Select Grade</option>
</select>
</div>
<div class="col-md-1 col-sm-12" id="lable1"><id="lable1">user</div>
<div class="col-md-2">
<!--select username-->
<select class="selectpicker form-control" name="user" id="user" autofocus="autofocus" required>
<option value="">Select an Option</option>
</select>
<!--select username-->
</div>
How can I hanlde data from select option form instead of input username to
<input type="text" required autocomplete="off" name="user_name"/>

Answer 1

Accessing HTML <form> elements in PHP
All HTML elements in a HTML form can access by PHP with their name with these variables:
$_POST['NAME'] or $_GET['NAME']
GET or POST depends on your form action.
And the value of these Variables are the value attribute of the HTML element
As described in form.guide Handling select box (drop-down list) in a PHP form
This is an example for select element
HTML :
<p>
What is your Gender?
<select name="formGender">
<option value="">Select...</option>
<option value="M">Male</option>
<option value="F">Female</option>
</select>
</p>
PHP :
<?php
if(isset($_POST['formSubmit']) ) //IF FORM SUBMIT IS PRESSED
{
$varMovie = $_POST['formMovie']; // Other form inputs
$varName = $_POST['formName']; // Other form inputs
$varGender = $_POST['formGender']; //Our Select element
$errorMessage = "";
// - - - snip - - -
}
?>
In your example :
HTML :
<!--select username-->
<select class="selectpicker form-control" name="user" id="user" autofocus="autofocus" required>
<option value="user1">USER ONE</option>
<option value="user2">USER TWO</option>
</select>
<!--select username-->
And you can use in your PHP:
if(isset($_POST['user']) ){
$name=$_POST['user']; //user1 if USER ONE selected or user2 if second one...
}