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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 |
|---|---|
| 308 | include_once $mu_plugin; |
| 309 | |
| 310 | /** |
| 311 | * Fires once a single must-use plugin has loaded. |
| 312 | * |
| 313 | * @since 5.1.0 |
| 314 | * |
| 315 | * @param string $mu_plugin Full path to the plugin's main file. |
| 316 | */ |
| 317 | do_action( 'mu_plugin_loaded', $mu_plugin ); |
| 318 | } |
| 319 | unset( $mu_plugin ); |
| 320 | |
| 321 | // Load network activated plugins. |
| 322 | if ( is_multisite() ) { |
| 323 | foreach ( wp_get_active_network_plugins() as $network_plugin ) { |
| 324 | wp_register_plugin_realpath( $network_plugin ); |
| 325 | include_once $network_plugin; |
| 326 | |