How to add code in the content area in a Wordpress theme?

Question

I basically want to add an embedded form at the end of every blog post just below the main content area (I tried adding in the footer but it gets skipped due to showing up at the very bottom of the page). Where exactly do I put the code in the editor?

Answer 1

If you want to modify the content before it is output to the screen, use the_content filter:

add_filter( 'the_content', 'change_the_content' )
function change_the_content($content) {
   $content = $content . "your additional content";
   return $content;
}

See docs here: https://codex.wordpress.org/Plugin_API/Filter_Reference/the_content .

Answer 2

You don't, if you want to embed something in a post, you have 2 options:

• oembed: Great for stuff like youtube, and other things, think of embeds, think of things that can be represented as URLs, e.g. copy paste a youtube URL on to a blank line and it turns into a youtube player
• shortcodes: This is how you run PHP code and insert HTML inside a post
• filters: You can append the code via the_content filter to your posts when they're rendered. This allows you to add things without modifying the post content

Anything that will let you copy paste a form as is into a post edit screen is going to be a security problem, dramatically increasing the chances of your site becoming hackable