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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 |
|---|---|
| 223 | * The load-* hook fires in a number of contexts. This hook is for plugin screens |
| 224 | * where the file to load is directly included, rather than the use of a function. |
| 225 | * |
| 226 | * The dynamic portion of the hook name, `$plugin_page`, refers to the plugin basename. |
| 227 | * |
| 228 | * @see plugin_basename() |
| 229 | * |
| 230 | * @since 1.5.0 |
| 231 | */ |
| 232 | do_action( 'load-' . $plugin_page ); |
| 233 | |
| 234 | if ( !isset($_GET['noheader'])) |
| 235 | require_once(ABSPATH . 'wp-admin/admin-header.php'); |
| 236 | |
| 237 | if ( file_exists(WPMU_PLUGIN_DIR . "/$plugin_page") ) |
| 238 | include(WPMU_PLUGIN_DIR . "/$plugin_page"); |
| 239 | else |
| 240 | include(WP_PLUGIN_DIR . "/$plugin_page"); |
| 241 | } |