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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 |
|---|---|
| 443 | $mu_plugin = $_wp_plugin_file; // Avoid stomping of the $mu_plugin variable in a plugin. |
| 444 | |
| 445 | /** |
| 446 | * Fires once a single must-use plugin has loaded. |
| 447 | * |
| 448 | * @since 5.1.0 |
| 449 | * |
| 450 | * @param string $mu_plugin Full path to the plugin's main file. |
| 451 | */ |
| 452 | do_action( 'mu_plugin_loaded', $mu_plugin ); |
| 453 | } |
| 454 | unset( $mu_plugin, $_wp_plugin_file ); |
| 455 | |
| 456 | // Load network activated plugins. |
| 457 | if ( is_multisite() ) { |
| 458 | foreach ( wp_get_active_network_plugins() as $network_plugin ) { |
| 459 | wp_register_plugin_realpath( $network_plugin ); |
| 460 | |
| 461 | $_wp_plugin_file = $network_plugin; |