I am working on a CSS and JS compiler and need to find a way to list the contents of wp_head()

I am trying to get a list of all CSS/JS files and inline CSS on any give page.

Hooking on the wp_head action does not do anything

I was hoping that something like this would work

function head_content($list){



add_action('wp_head', 'head_content');

any help is appreciated.


got something working

function head_content($list){


    return $list;


add_filter('print_styles_array', 'head_content');
add_filter('print_script_array', 'head_content');

this lists all css/js files handles

  • wp_head is an action, actions don't have data passed to them. it's just an event that other things are hooked to, like wp_enqueue_scripts.
    – Milo
    May 15, 2016 at 17:43
  • @Milo thnx for the info , is there any way to get the contents of the head tag?
    – Benn
    May 15, 2016 at 17:55

3 Answers 3


I wanted to search-and-replace in the header, but Neither @majick or @Samuel Elh answers worked for me directly. So, combining their answers I got what eventually works:

function start_wp_head_buffer() {

function end_wp_head_buffer() {
    $in = ob_get_clean();

    // here do whatever you want with the header code
    echo $in; // output the result unless you want to remove it
add_action('wp_head','end_wp_head_buffer', PHP_INT_MAX); //PHP_INT_MAX will ensure this action is called after all other actions that can modify head

It was added to functions.php of my child theme.

  • you nailed it bud!
    – Benn
    Oct 11, 2016 at 13:29
  • any particular reason for this 998 ?
    – Benn
    Oct 11, 2016 at 13:29
  • 1
    @Benn no, I like it more than 999 :)
    – Putnik
    Oct 11, 2016 at 13:38

Simple solution is to listen for wp_head in a custom function, just like WordPress does in wp-includes/general-template.php for wp_head() function.

I mean something like:

function head_content() {
    return ob_get_clean();
// contents
var_dump( head_content() );

Later, use regex or other tool to filter the contents you are targeting..

Hope that helps.

  • Use \DOMDocument or another xml parser. Do not use regex. Never, ever use regex on html.
    – mopsyd
    May 12, 2018 at 19:21

You could buffer the wp_head output by adding some wrapper actions to it:

function start_wp_head_buffer() {ob_start;}
function end_wp_head_buffer() {global $wpheadcontents; $wpheadcontents = ob_get_flush();}

You can then call global $wpheadcontents; elsewhere to access the content and process it.

But, in this case, it may be simpler to just get the information you are looking for directly from the global $wp_styles and $wp_scripts variables.

function print_global_arrays() {
    global $wp_styles, $wp_scripts;
    echo "Styles Array:"; print_r($wp_styles);
    echo "Scripts Array:"; print_r($wp_scripts);

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