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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 |
|---|---|
| 124 | <?php |
| 125 | |
| 126 | $current_screen->render_screen_meta(); |
| 127 | |
| 128 | if ( is_network_admin() ) |
| 129 | do_action('network_admin_notices'); |
| 130 | elseif ( is_user_admin() ) |
| 131 | do_action('user_admin_notices'); |
| 132 | else |
| 133 | do_action('admin_notices'); |
| 134 | |
| 135 | do_action('all_admin_notices'); |
| 136 | |
| 137 | if ( $parent_file == 'options-general.php' ) |
| 138 | require(ABSPATH . 'wp-admin/options-head.php'); |
| 139 | |