Please help not able to resolve, trying since three days but not able to know what the reason its throwing me such message. (below is my complete code).

<?php

$title = $_POST['title'];
$datenow = date('Y/m/d');
$author = $_POST['author'];
$content = $_POST['content'];
$image_name = $_FILES['image_name']['name'];
$image_type = $_FILES['image_name']['type'];
$image_size = $_FILES['image_name']['size'];
$image_tmp = $_FILES['image_name']['tmp_name'];

if ($title =='' || $author =='' || $content =='') {
    echo "<script>alert('Any feild is empty')</script>";
    exit();
}
if ($image_type =='image/jpeg' || $image_type =='image/png' || $image_type =='image/gif') {

    if ($image_size<=5000000000) {
        move_uploaded_file($image_tmp, "images/$image_name");
    }
    else{
        echo "<script>alert('Image is larger, only 50kb size is allowed')</script>";
    }
}
else{
    echo "<script>alert('image type is invalid')</script>";
}

// insert query
   $sth = $con->prepare(" INSERT INTO posts (post_title, post_date, post_author, post_image, post_content) VALUE (:title,:datenow,:author,:image_name,:content) ");

$sth->bindParam(':post_title', $title);
$sth->bindParam(':post_date', $datenow);
$sth->bindParam(':post_author', $author);
$sth->bindParam(':post_image', $image_name);
$sth->bindParam(':post_content', $content);

$sth = $con->prepare(" INSERT INTO posts (post_title, post_date, post_author, post_image, post_content) VALUES (:post_title,:post_date,:post_author,:post_image,:post_content) ");

$sth->bindParam(':post_title', $title);
$sth->bindParam(':post_date', $datenow);
$sth->bindParam(':post_author', $author);
$sth->bindParam(':post_image', $image_name);
$sth->bindParam(':post_content', $content);