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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 | 
|---|---|
| 992 |       * This filter is only fired when an endpoint is requested which is not already protected by | 
| 993 |       * WordPress core. As such, it exclusively allows providing further protected endpoints in | 
| 994 |       * addition to the admin backend, login pages and protected Ajax actions. | 
| 995 |       * | 
| 996 |       * @since 5.2.0 | 
| 997 |       * | 
| 998 |       * @param bool $is_protected_endpoint Whether the currently requested endpoint is protected. | 
| 999 |       *                                    Default false. | 
| 1000 |       */ | 
| 1001 |      return (bool) apply_filters( 'is_protected_endpoint', false ); | 
| 1002 | } | 
| 1003 |  | 
| 1004 | /** | 
| 1005 |  * Determines whether we are currently handling an Ajax action that should be protected against WSODs. | 
| 1006 |  * | 
| 1007 |  * @since 5.2.0 | 
| 1008 |  * | 
| 1009 |  * @return bool True if the current Ajax action should be protected. | 
| 1010 |  */ |