how to integrate the mailchimp with core php - email

Question

I need to integrate the mail chimp api with core php I tried more type of codes but not working. Finally, I found the below code. I have created an api key with mailchimp, likewise campaigns, template and list in the mailchimp.
<script src="jquery.min.js" type="text/javascript"></script>
<script>
$(document).ready(function() {
$('#subscribe').submit(function() {
if (!valid_email_address($("#email").val()))
{
$(".message").html('The email address you entered was invalid. Please make sure you enter a valid email address to subscribe.');
}
else
{
$(".message").html("<span style='color:green;'>Adding your email address...</span>");
$.ajax({
url: 'subscribe.php',
data: $('#subscribe').serialize(),
type: 'POST',
success: function(msg) {
if(msg=="success")
{
$("#email").val("");
$(".message").html('<span style="color:green;">You have successfully subscribed to our mailing list.</span>');
}
else
{
$(".message").html('The email address you entered was invalid. Please make sure you enter a valid email address to subscribe.');
}
}
});
}
return false;
});
});
function valid_email_address(email)
{
var pattern = new RegExp(/^[+a-zA-Z0-9._-]+#[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i);
return pattern.test(email);
}
</script>
<?php
$api_key = "key";
$list_id = "id";
require('inc/MAPI.class.php');
$Mailchimp = #new Mailchimp( $api_key );
echo bool($Mailchimp);
//$Mailchimp_Lists = #new Mailchimp_Lists( $Mailchimp );
//$subscriber = $Mailchimp_Lists->subscribe( $list_id, array( 'email' => htmlentities($_POST['email']) ) );
if ( ! empty( $subscriber['leid'] ) ) {
echo "success";
}
else
{
echo "fail";
}
?>
<div class="message"></div>
<form role="form" method="post" id="subscribe">
<input type="email" id="email" name="email" placeholder="you#yourself.com" value="">
<button type="submit">SUBSCRIBE</button>
</form>
This is my code, but it's not returning, errors only. Please help me.