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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 |
|---|---|
| 3376 | |
| 3377 | /** |
| 3378 | * Filters the Heartbeat response sent. |
| 3379 | * |
| 3380 | * @since 3.6.0 |
| 3381 | * |
| 3382 | * @param array $response The Heartbeat response. |
| 3383 | * @param string $screen_id The screen id. |
| 3384 | */ |
| 3385 | $response = apply_filters( 'heartbeat_send', $response, $screen_id ); |
| 3386 | |
| 3387 | /** |
| 3388 | * Fires when Heartbeat ticks in logged-in environments. |
| 3389 | * |
| 3390 | * Allows the transport to be easily replaced with long-polling. |
| 3391 | * |
| 3392 | * @since 3.6.0 |
| 3393 | * |
| 3394 | * @param array $response The Heartbeat response. |