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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 |
|---|---|
| 135 | * Fires as an admin screen or script is being initialized. |
| 136 | * |
| 137 | * Note, this does not just run on user-facing admin screens. |
| 138 | * It runs on admin-ajax.php and admin-post.php as well. |
| 139 | * |
| 140 | * This is roughly analgous to the more general 'init' hook, which fires earlier. |
| 141 | * |
| 142 | * @since 2.5.0 |
| 143 | */ |
| 144 | do_action( 'admin_init' ); |
| 145 | |
| 146 | if ( isset($plugin_page) ) { |
| 147 | if ( !empty($typenow) ) |
| 148 | $the_parent = $pagenow . '?post_type=' . $typenow; |
| 149 | else |
| 150 | $the_parent = $pagenow; |
| 151 | if ( ! $page_hook = get_plugin_page_hook($plugin_page, $the_parent) ) { |
| 152 | $page_hook = get_plugin_page_hook($plugin_page, $plugin_page); |
| 153 | // backwards compatibility for plugins using add_management_page |