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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 |
|---|---|
| 354 | $mu_plugin = $_wp_plugin_file; // Avoid stomping of the $mu_plugin variable in a plugin. |
| 355 | |
| 356 | /** |
| 357 | * Fires once a single must-use plugin has loaded. |
| 358 | * |
| 359 | * @since 5.1.0 |
| 360 | * |
| 361 | * @param string $mu_plugin Full path to the plugin's main file. |
| 362 | */ |
| 363 | do_action( 'mu_plugin_loaded', $mu_plugin ); |
| 364 | } |
| 365 | unset( $mu_plugin, $_wp_plugin_file ); |
| 366 | |
| 367 | // Load network activated plugins. |
| 368 | if ( is_multisite() ) { |
| 369 | foreach ( wp_get_active_network_plugins() as $network_plugin ) { |
| 370 | wp_register_plugin_realpath( $network_plugin ); |
| 371 | |
| 372 | $_wp_plugin_file = $network_plugin; |