How do I get value from input radio in a href?

I'm creating a card with values, example:

Subscribers:
Value: 5,50$
Value: 9,50$
Value: 15,50$
--------

Each radio input has a value and a link as a variable... so I'm passing a variable with the link to your checkout in the value... but I want that when I select a value like that, it passes the correct variable to the submit .

<?php $url = 'wwww.exemplo.com/checkout1'?>
<?php $url2 = 'wwww.exemplo.com/checkout2'?>
<?php $url3 = 'wwww.exemplo.com/checkout3'?>
<?php $url4 = 'wwww.exemplo.com/checkout4'?>
<form>
<input type="radio" name="opcao" id="1" value="<?php echo $url;?>">
<input type="radio" name="opcao" id="2" value="<?php echo $url2;?>">
<input type="radio" name="opcao" id="3" value="<?php echo $url3;?>">
<input type="radio" name="opcao" id="4" value="<?php echo $url4;?>">    
<a href=""><button id="submit">Submit</button>
</form>

How do I get the input value in my href

Solution

You dont actually need to use an anchor tag, you can achieve a querystring and filling the $_GET array using a <form method="get" ....>. If that is your aim?


<?php
// start by using an array for your values, its more useful and extendable
$urls = ['wwww.exemplo.com/checkout1',
        'wwww.exemplo.com/checkout2',
        'wwww.exemplo.com/checkout3',
        'wwww.exemplo.com/checkout4'
        ];
# Now use a form with a GET method, 
# which will set the querystring and fill the $_GET array in the `action` form
?>
<form action="action_page.php" method="get">

<?php
foreach ( $urls as $id => $url){
    echo "<input type='radio' name='opcao' id='$id' value='$url'>";
}
?>
    <button type="submit" id="submit">Submit</button>
</form>

-- UPDATE

I dont think you actually want a radio button set for this, all you need is a set of anchor tags like this

<?php
// start by using an array for your values, its more useful and extendable
$urls = ['wwww.exemplo.com/checkout1',
        'wwww.exemplo.com/checkout2',
        'wwww.exemplo.com/checkout3',
        'wwww.exemplo.com/checkout4'
        ];
<?php
foreach ( $urls as $id => $url){
    echo "<a href='http://$url'> SITE $id</a>";
}
?>

---UPDATE 2

$urls = ['https://wwww.exemplo.com/checkout1',
        'https://wwww.exemplo.com/checkout2',
        'https://wwww.exemplo.com/checkout3',
        'https://wwww.exemplo.com/checkout4'
        ];

foreach ( $urls as $id => $url){
    echo "<a href='$url'> SITE $id</a>";

}

Should get you

<a href='https://wwww.exemplo.com/checkout1'> SITE 0</a>
<a href='https://wwww.exemplo.com/checkout2'> SITE 1</a>
<a href='https://wwww.exemplo.com/checkout3'> SITE 2</a>
<a href='https://wwww.exemplo.com/checkout4'> SITE 3</a>

Also, dont be afraid of 'https%3A%2F%2Fwwww.exemplo.com%2Fcheckout1' as that is just 'https://Fwwww.exemplo.com?checkout1' that has been URL Encoded.