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WordPress Filter Final HTML Output

Here is the code to to filter the final HTML output in WordPress.

function callback($buffer) {
  // modify buffer here, and then return the updated code
  return $buffer;
}

function buffer_start() { ob_start("callback"); }

function buffer_end() { ob_end_flush(); }

add_action('wp_loaded', 'buffer_start');
add_action('shutdown', 'buffer_end');

One of the use case of this is when you want to add “nofollow” rel to all links pointing to external websites.

Narayan Prusty
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Narayan Prusty

I am a full-stack web developer. I specialize in Blockchain and JavaScript. This is my personal blog where I write about programming and technologies that I learn and feel interesting to share.

6 years ago WordPress
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