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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 |
---|---|
3415 |
|
3416 | /** |
3417 | * Filters the Heartbeat response sent. |
3418 | * |
3419 | * @since 3.6.0 |
3420 | * |
3421 | * @param array $response The Heartbeat response. |
3422 | * @param string $screen_id The screen ID. |
3423 | */ |
3424 | $response = apply_filters( 'heartbeat_send', $response, $screen_id ); |
3425 |
|
3426 | /** |
3427 | * Fires when Heartbeat ticks in logged-in environments. |
3428 | * |
3429 | * Allows the transport to be easily replaced with long-polling. |
3430 | * |
3431 | * @since 3.6.0 |
3432 | * |
3433 | * @param array $response The Heartbeat response. |