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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 | 
|---|---|
| 191 |       * non-web runtimes. If this filter returns true, maintenance mode will be | 
| 192 |       * active and the request will end. If false, the request will be allowed to | 
| 193 |       * continue processing even if maintenance mode should be active. | 
| 194 |       * | 
| 195 |       * @since 4.6.0 | 
| 196 |       * | 
| 197 |       * @param bool $enable_checks Whether to enable maintenance mode. Default true. | 
| 198 |       * @param int  $upgrading     The timestamp set in the .maintenance file. | 
| 199 |       */ | 
| 200 |      if ( ! apply_filters( 'enable_maintenance_mode', true, $upgrading ) ) { | 
| 201 |           return; | 
| 202 |      } | 
| 203 |  | 
| 204 |      if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) { | 
| 205 |           require_once( WP_CONTENT_DIR . '/maintenance.php' ); | 
| 206 |           die(); | 
| 207 |      } | 
| 208 |  | 
| 209 |      wp_load_translations_early(); |