How to Add a Share URL automatically at the end of each post and page for WordPress?

I sometimes need to copy the posts to somewhere for easy sharing purpose and at the end of the post, I will point out the URL for the original article. And I find it not so convenient as I have to manually copy the URL and paste. The following trick can solve this problem easily. At the end of each posts/pages, the link for the current page will be appended.

Edit the template file functions.php and append the following PHP code to the end of file.

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// helloacm.com
add_filter( 'the_content', 'insert_post' );
 
function insert_post( $content ) {
    $post_id = get_the_ID();
    $link = get_permalink($post_id);
    $title = get_the_title($post_id);
    return $content.'<BR/>Share this URL：<a title="'.$title.'" href="'.$link.'"><B>'.$link.'</B></a>';
}

// helloacm.com
add_filter( 'the_content', 'insert_post' );

function insert_post( $content ) {
    $post_id = get_the_ID();
    $link = get_permalink($post_id);
    $title = get_the_title($post_id);
    return $content.'<BR/>Share this URL：<a title="'.$title.'" href="'.$link.'"><B>'.$link.'</B></a>';
}

It is very straightforward and if you know English you understand what it means. The wordpress is so powerful because it already provides so many handy functions such as get_the_ID() which obtains the ID of the current page/post，get_permalink() that returns the URL of the page/posts，and get_the_title() gets the title of the pages/posts. These two functions have the optional parameter [post id] which if omitted will return the current page/posts.

–EOF (The Ultimate Computing & Technology Blog) —