simple plugin problem

  • I have problem with this very simple plugin.

    <?php
/*
Plugin Name: Simple Add To Footer
Plugin URI: https://localhost/wordpress/
Description: Add HTML snippets to posts and/or page footer.
It is a plugin tutorial using latest plugin API of WP2.7+
Version: 0.1
Author: me
Author URI: https://blog.orangecabin.com/
Disclaimer: Use at your own risk. No warranty expressed or implied is provided.
*/
add_action('wp_footer', 'simple_add_to_footer_wp_footer');
function simple_add_to_footer_wp_footer(){
	echo '<div>Hello world! '. get_option('blogname') .' </div>';
}

add_filter('the_content', 'simple_add_to_footer_the_content');
function simple_add_to_footer_the_content($content = ''){
	return $content .'<div> I am '. get_the_title(). '</div>' ;
}
?>

    When I go to another page from home page, this warning comes up at the top of my site. I am using free hosting.

    ” PHP Error Message

    Warning: implode() [function.implode]: Invalid arguments passed in /home/a3755187/public_html/wordpress/wp-content/plugins/simple_optimization/main.php on line 39

    Free Web Hosting “

    This is link of that from my blog.

    https://jahurahmed.co.cc/wordpress/?page_id=13

    Can anyone solve it?

    Thanks
    Jahur

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