gistfile1.txt

<?php
  $db = new mysqli("localhost", "...", "...", "...");

  if ($db->connect_error) {
		echo "Could not connect to database.";
		exit;
	}
	else {
		$emerd = $_POST["email"];

		$db->query("INSERT INTO emails (email) VALUES (' " . $emerd . "')");

		echo json_encode(array(
		   "email" => $emerd
		));
?>