Why is MySql not storing boolean value with php - php

Question

I have a database table with two columns that have been set as boolean. Whenever I store something in the table everything works correctly except the boolean columns are always false. The columns are featured post and published.
I am using php 7.1.1 and MariaDB 10.1.21 on my xampp local installation.
Output of show table:
CREATE TABLE `posts` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(255) NOT NULL,
`content` text NOT NULL,
`seo_description` varchar(255) NOT NULL,
`featured_post` tinyint(1) NOT NULL DEFAULT '0',
`published` tinyint(1) NOT NULL DEFAULT '0',
`seo_title` varchar(255) NOT NULL,
`post_type` enum('blog','product') NOT NULL,
`featured_image_id` int(11) NOT NULL,
`category_id` int(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `title` (`title`),
UNIQUE KEY `seo_title` (`seo_title`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT
Php code defining onr of the variables, the other is exactly the same:
if(isset($_POST["published"])){
$published = sanitizeInput($_POST["published"]);
if($published){ //test to see if correct values where being sent and they were
echo json_encode("boolean true");
} else {
echo json_encode("boolean false");
}
} else {
$published = false;
}
$query = "insert into posts "
. "(title, content, seo_description, featured_post, published, seo_title, post_type, category_id) "
. "values "
. "(:title, :content, :seo_description, :featured_post, :published, :seo_title, :post_type, :category_id)";
$stmt = $pdo->prepare($query);
$stmt->bindValue("featured_post", $featuredPost, PDO::PARAM_BOOL);
$stmt->bindValue("published", $published, PDO::PARAM_BOOL);
$stmt->bindValue("title", $title);
$stmt->bindValue("content", $content);
$stmt->bindValue("seo_description", $seoDescription);
$stmt->bindValue("seo_title", $seoTitle);
$stmt->bindValue("post_type", $postType);
$stmt->bindValue("category_id", $categoryId);
$stmt->execute();
Any help would be much appreciated.
Thanks in advance