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do_action( 'wp_head' )

Prints scripts or data in the head tag on the front end.

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Description
- Source
- Changelog
Related
- Used By
User Contributed Notes

Description Description

Source Source

File: wp-includes/general-template.php

Changelog Changelog

Changelog
Version	Description
1.5.0	Introduced.

Used By Used By

Used By
Used By	Description
wp-includes/general-template.php: wp_head()	Fire the wp_head action.

User Contributed Notes User Contributed Notes

0

Contributed by Aurovrata Venet — 2 years ago

taken from the old codex pages:

function hook_css() {
    ?>
        <style>
            .wp_head_example {
                background-color : #f1f1f1;
            }
        </style>
    <?php
}
add_action('wp_head', 'hook_css');

or for inline scripts which need to be placed in the head,

function hook_javascript() {
    ?>
        <script>
            alert('Page is loading...');
        </script>
    <?php
}
add_action('wp_head', 'hook_javascript');

The wp_head() function which ones sees in all header.php files, is simply triggering the hool do_action(‘wp_head’). WordPress core files then hooks it multiple times to print the head,

add_action( 'wp_head',             '_wp_render_title_tag',            1     );
add_action( 'wp_head',             'wp_enqueue_scripts',              1     );
add_action( 'wp_head',             'wp_resource_hints',               2     );
add_action( 'wp_head',             'feed_links',                      2     );
add_action( 'wp_head',             'feed_links_extra',                3     );
add_action( 'wp_head',             'rsd_link'                               );
add_action( 'wp_head',             'wlwmanifest_link'                       );
add_action( 'wp_head',             'adjacent_posts_rel_link_wp_head', 10, 0 );
add_action( 'wp_head',             'locale_stylesheet'                      );
add_action( 'wp_head',             'noindex',                          1    );
add_action( 'wp_head',             'print_emoji_detection_script',     7    );
add_action( 'wp_head',             'wp_print_styles',                  8    );
add_action( 'wp_head',             'wp_print_head_scripts',            9    );
add_action( 'wp_head',             'wp_generator'                           );
add_action( 'wp_head',             'rel_canonical'                          );
add_action( 'wp_head',             'wp_shortlink_wp_head',            10, 0 );
add_action( 'wp_head',             'wp_custom_css_cb',                101   );
add_action( 'wp_head',             'wp_site_icon',                    99    );

Expand full source code Collapse full source code

However, more interestingly you can also use it to add some meta tags,

function hook_nocache() {
    ?>
  <meta http-equiv="cache-control" content="max-age=0" />
  <meta http-equiv="cache-control" content="no-cache" />
  <meta http-equiv="expires" content="0" />
  <meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
  <meta http-equiv="pragma" content="no-cache" />
    <?php
}
add_action('wp_head', 'hook_nocache');

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