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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 44 |      // Don't index any of these forms | 
| 45 |      add_filter( 'pre_option_blog_public', '__return_zero' ); | 
| 46 |      add_action( 'login_head', 'noindex' ); | 
| 47 |  | 
| 48 |      if ( empty($wp_error) ) | 
| 49 |           $wp_error = new WP_Error(); | 
| 50 |  | 
| 51 |      // Shake it! | 
| 52 |      $shake_error_codes = array( 'empty_password', 'empty_email', 'invalid_email', 'invalidcombo', 'empty_username', 'invalid_username', 'incorrect_password' ); | 
| 53 |      $shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes ); | 
| 54 |  | 
| 55 |      if ( $shake_error_codes && $wp_error->get_error_code() && in_array( $wp_error->get_error_code(), $shake_error_codes ) ) | 
| 56 |           add_action( 'login_head', 'wp_shake_js', 12 ); | 
| 57 |  | 
| 58 |      ?> | 
| 59 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | 
| 60 | <html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>> | 
| 61 | <head> | 
| 62 |      <title><?php bloginfo('name'); ?> › <?php echo $title; ?></title> |