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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 |
|---|---|
| 278 | include_once( $mu_plugin ); |
| 279 | |
| 280 | /** |
| 281 | * Fires once a single must-use plugin has loaded. |
| 282 | * |
| 283 | * @since 5.1.0 |
| 284 | * |
| 285 | * @param string $mu_plugin Full path to the plugin's main file. |
| 286 | */ |
| 287 | do_action( 'mu_plugin_loaded', $mu_plugin ); |
| 288 | } |
| 289 | unset( $mu_plugin ); |
| 290 | |
| 291 | // Load network activated plugins. |
| 292 | if ( is_multisite() ) { |
| 293 | foreach ( wp_get_active_network_plugins() as $network_plugin ) { |
| 294 | wp_register_plugin_realpath( $network_plugin ); |
| 295 | include_once( $network_plugin ); |
| 296 | |