echo from the submission form value with different IDs - php

Question

I have a submission form with three of them
two of them are okay which I use one ID for all the value that going to be submit
but one of them which I'm struggling now is the one with all different values of course and the selection form also with different ID which made me confuse how can I echo it.
<form action="" method="post">
<div data-role="fieldcontain">
<fieldset data-role="controlgroup" data-type="horizontal" >
<legend>เลือกช่อง</legend>
<input type="radio" name="radio-choice-1" id="radio-choice-1" value="ch41" checked="checked" />
<label for="radio-choice-1">number 1</label>
<input type="radio" name="radio-choice-1" id="radio-choice-2" value="ch80" />
<label for="radio-choice-2">number 2</label>
<input type="radio" name="radio-choice-1" id="radio-choice-3" value="ch44" />
<label for="radio-choice-3>"number 3</label>
<input type="radio" name="radio-choice-1" id="radio-choice-4" value="ch42" />
<label for="radio-choice-4">number 4</label>
<input type="radio" name="radio-choice-1" id="radio-choice-5" value="ch83" />
<label for="radio-choice-5">number 5</label>
</fieldset>
</div>
</form>
and here is what I'm trying to echo
<video width="5%" height="5%" src="http://mydomain:<?php echo $_POST["radio-choice-1"]; ?>-<?php echo $_POST["date"]; ?>-<?php echo $_POST["time"]; ?>" alt="" controls="" tabindex="0">
so the problem is on the "radio-choice-#"
since it has 5 numbers on the ID
here is the example
<input type="radio" name="radio-choice-1" id="radio-choice-2" value="ch80" />
<label for="radio-choice-2">number 2</label>
<input type="radio" name="radio-choice-1" id="radio-choice-3" value="ch44" />
<label for="radio-choice-3>"number 3</label>
<input type="radio" name="radio-choice-1" id="radio-choice-4" value="ch42" />
<label for="radio-choice-4">number 4</label>
<input type="radio" name="radio-choice-1" id="radio-choice-5" value="ch83" />
<label for="radio-choice-5">number 5</label>
so if they choose menu number 5
I want to echo here
<video width="5%" height="5%" src="http://mydomain:<?php echo $_POST["the value of number 5"]; ?">

Answer 1

Your code for actually getting the value from the radio button was already correct. Here is something you could use to keep data more organized and be able to get the 'page' number you're on.
<?php
$items = array('ch41', 'ch80', 'ch44', 'ch42', 'ch83');
$page = array_search((empty($_POST['choice']) ? 'ch41' : $_POST['choice']), $items) + 1; // Change 'ch41' to whatever the default page is
// To name the labels, you can add keys for your values like so:
$items = array('home' => 'ch41', 'page' => 'ch80', 'channel' => 'ch44', 'news' => 'ch42', 'contact' => 'ch83');
$page = (empty($_POST['choice']) ? 'home' : array_search($_POST['choice'], $items)); // Replace 'home' with whatever the default page is
// Then replace the <?= $key + 1 ?> below with just <?= $key ?>
?>
You are currently on page <?= $page ?>.
<form action="" method="post">
<div data-role="fieldcontain">
<fieldset data-role="controlgroup" data-type="horizontal" >
<legend>เลือกช่อง</legend>
<?php foreach ($items as $key => $value): ?>
<input type="radio" name="choice" id="radio-choice-<?= $key ?>" value="<?= $value ?>"<?= $key === $_POST['choice'] ? ' checked="checked"' : '' ?> />
<label for="radio-choice-<?= $key ?>">number <?= $key + 1 ?></label>
<?php endforeach; ?>
</fieldset>
</div>
</form>
A rough example. You can add additional channels to the $items array. It will default to page 1 and automatically check the radio button for the page you're currently viewing. I hope this is what you wanted.