根据用户类型显示/隐藏 Select 选项

Question

I want to show/hide option from a select drop-down for free user & paid user form a php session value.

   <select id="book" name="book" style="display:none" onchange="update_session_value(this.value)">
        <option id = "c1" class="b1" value="A1">A1</option> 
        <option id = "c2" class="b1" value="A2">A2</option> 
        <option id = "c3" class="b2" value="A3">A3</option> 
        <option id = "c4"class="b2" value="A4">A4</option> 
    </select>

If

$_SESSION['mytype']= freeuser;

then hide option c1 & c2 & show c3 & c4 if

$_SESSION['mytype']= paiduser;

then hide c3, c4 & show c1, c2

How can I achieve this?

Answer 1

   <select id="book" name="book" style="display:none" onchange="update_session_value(this.value)">
<?php if ($_SESSION['mytype'] === 'paiduser') { ?>
        <option id = "c1" class="b1" value="A1">A1</option> 
        <option id = "c2" class="b1" value="A2">A2</option> 
<?php } else { ?>
        <option id = "c3" class="b2" value="A3">A3</option> 
        <option id = "c4"class="b2" value="A4">A4</option> 
<?php } ?>
    </select>