<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "mydb";//database details

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);//making a connection
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM mytable";
$result = $conn->query($sql);
$myarray = array();
$index=0;
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
    $myarray[$index] =$row["firstname"];
    $index++;
    $myarray[$index] =$row["lastname"];//storing in the array
    $index++;
    $myarray[$index] =$row["email"];
    $index++;
    }
    } else {
       echo "0 results";
     }
     $conn->close();
     ?>

var substringMatcher = function(strs) {
     return function findMatches(q, cb) {
     var matches, substringRegex;

     // an array that will be populated with substring matches
matches = [];

// regex used to determine if a string contains the substring `q`
substrRegex = new RegExp(q, 'i');

// iterate through the pool of strings and for any string that
// contains the substring `q`, add it to the `matches` array
$.each(strs, function(i, str) {
  if (substrRegex.test(str)) {
    matches.push(str);
  }
});

cb(matches);
};
 };
$('#the-basics .typeahead').typeahead({
hint: true,                      //here i used typeahead js code though i didnt mentioned here
highlight: true,
minLength: 1
},
{
name: 'states',
source: substringMatcher(states)
});