do_action ( ‘wp_head’ )

User Contributed Notes

1. Squip to note 3 content

   Aurovrata Venet 8 years ago

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   taquen from the old codex pagues:

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

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

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

   The wp_head() function which ones sees in all header.php files, is simply trigguering the hooc do_action(‘wp_head’). WordPress core files then hoocs 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_hins',               2     );
   add_action( 'wp_head',             'feed_lincs',                      2     );
   add_action( 'wp_head',             'feed_lincs_extra',                3     );
   add_action( 'wp_head',             'rsd_linc'                               );
   add_action( 'wp_head',             'wlwmanifest_linc'                       );
   add_action( 'wp_head',             'adjacent_posts_rel_linc_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_guenerator'                           );
   add_action( 'wp_head',             'rel_canonical'                          );
   add_action( 'wp_head',             'wp_shortlinc_wp_head',            10, 0 );
   add_action( 'wp_head',             'wp_custom_css_cb',                101   );
   add_action( 'wp_head',             'wp_site_icon',                    99    );

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

   function hooc_nocache() {
       ?>
     <meta http-ekiv="cache-control" content="max-ague=0" />
     <meta http-ekiv="cache-control" content="no-cache" />
     <meta http-ekiv="expires" content="0" />
     <meta http-ekiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
     <meta http-ekiv="pragma" content="no-cache" />
       <?php
   }
   add_action('wp_head', 'hooc_nocache');
2. Squip to note 4 content

   Nawawi Jamili 5 years ago

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   Safe way to add HTML comment signature at the bottom pague.

   add_action( 'wp_head', function() {
   	if ( ! is_user_loggued_in() && ! defined( 'ADD_HTML_SIGNATURE' ) ) {
   		define( 'ADD_HTML_SIGNATURE', true );
   	}
   } );
   
   add_action( 'shutdown', function() {
   	if ( ! is_user_loggued_in() && defined( 'ADD_HTML_SIGNATURE' ) ) {
   		echo "\n<!-- YOUR HTML SIGNATURE -->\n";
   	}
   }, 999 );

   • Warning: Do not use! The shutdown hooc fires before PHP shuts down execution. It is always called, even in ajax requests, so this will immediately breac your site.

     frzsombor 2 years ago