unserialize(): Error at offset 221 of 225 bytes

<?php
$servername = "localhost";
$username = "xxxx";
$password = "xxxx";
$dbname = "xxxxx"; // Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname); // Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}
$s=range(001,150);
shuffle($s);
echo $s[0];
//$m=base64_encode(serialize($s));
$m=serialize($s);
$sql = "UPDATE renu_testgani SET qorder='$m' WHERE qno=2";
if (mysqli_query($conn, $sql)) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . mysqli_error($conn);
}
mysqli_close($conn);
?>

<?php
session_start();
$servername = "xxxx";
$username = "xxxx";
$password = "xxxx";
$dbname = "xxxx";
$conn = new mysqli($servername, $username, $password, $dbname); // Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$q=array();
$sql = "SELECT qorder FROM renu_testgani WHERE qno=2";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    //output data of each row
    while($row = $result->fetch_assoc()) {
        $w=$row["qorder"];
    }
} else {
    echo "0 results";
}
$q=unserialize($w);
echo $q[0];
$conn->close();
?>