Multi selection input only submits the last selection - php

Question

I have a simple form, inside it there is check-boxes and multi selection inputs.
The problem I am having is:
The multi selection input only submits the last selection!
The checkboxes only works if I set a value="" but shouldn't work without it?
Here is the form:
<fieldset>
<p>Multi selection</p>
<select name="dropdown2[]" class="select multi-select " data-placeholder="Choose an option" multiple="multiple">
<optgroup label="Section">
<option>Drop Down Option A</option>
<option>Drop Down Option B</option>
</optgroup>
<optgroup label="Section">
<option>Drop Down Option A</option>
<option>Drop Down Option B</option>
</optgroup>
</select>
</fieldset>
<fieldset>
<p>Optional checkboxs</p>
<label class="checkbox">
<input name="11" type="checkbox"><span><i></i></span>
<p>CheckA</p>
</label>
<label class="checkbox">
<input name="11" type="checkbox"><span><i></i></span>
<p>CheckB</p>
</label>
</fieldset>
Here is the PHP:
<?php
// Only start sessions if they haven't been already to prevent errors
if (empty($_SESSION)){session_start();}
// If 'data' var was received via POST from form-validation.js
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
// There's not really a need for this line with modern browsers
ob_start();
// Open the div around the message
$message = "<div style=\"styling stuff\">";
// Loop through every single post value
foreach ($_REQUEST as $key => $value) {
// If it's not empty
if (!empty($value)) {
// Change the name attributes to look a bit more human-readable
$thisKey = str_replace("-", " ", str_replace("_", "|", $key));
// Populate the message var
$message .= "<strong>" . $thisKey . ":</strong> " . $value . "<br />";
}
}
// Close the div around the message
$message .= '</div>';
// Mail variables
$to = 'email#email.com';
$subject = 'New Message';
$headers = "From: email#email.com\r\n";
$headers .= "Reply-To: email#email.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
// Attempt to send
$sendMail = #mail($to, $subject, $message, $headers);
// If it fails...
if (!$sendMail) {
// Terminate processing with error
die("There was a problem sending the email");
} else {
// Terminate processing with success msg
die("Email was sent!");
}
// As above, no real need for this line with modern browsers
ob_flush();
// Terminate
die();
}
?>
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Answer 1

If you want to send multiple values via checkboxes, then they should be used in this way
<input name="11[]" type="checkbox">
<input name="11[]" type="checkbox">
instead of
<input name="11" type="checkbox">

Answer 2

if you need to submit multi check box then
use like this
<input name="11[]" type="checkbox" value="someval">
<input name="11[]" type="checkbox" value="someval" >
this will post checkbox elements as array
to retrieve
$chk = $_POST['11']; // this will be array
iterate through this array you will get all checked elements of name 11
still you need to provide some values to check box to work this