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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 |
|---|---|
| 3505 | |
| 3506 | /** |
| 3507 | * Filters the Heartbeat response sent. |
| 3508 | * |
| 3509 | * @since 3.6.0 |
| 3510 | * |
| 3511 | * @param array $response The Heartbeat response. |
| 3512 | * @param string $screen_id The screen ID. |
| 3513 | */ |
| 3514 | $response = apply_filters( 'heartbeat_send', $response, $screen_id ); |
| 3515 | |
| 3516 | /** |
| 3517 | * Fires when Heartbeat ticks in logged-in environments. |
| 3518 | * |
| 3519 | * Allows the transport to be easily replaced with long-polling. |
| 3520 | * |
| 3521 | * @since 3.6.0 |
| 3522 | * |
| 3523 | * @param array $response The Heartbeat response. |