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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 |
|---|---|
| 41 | |
| 42 | /** |
| 43 | * Filter Heartbeat AJAX response when no data is passed. |
| 44 | * |
| 45 | * @since 3.6.0 |
| 46 | * |
| 47 | * @param array|object $response The Heartbeat response object or array. |
| 48 | * @param string $screen_id The screen id. |
| 49 | */ |
| 50 | $response = apply_filters( 'heartbeat_nopriv_send', $response, $screen_id ); |
| 51 | |
| 52 | /** |
| 53 | * Fires when Heartbeat ticks in no-privilege environments. |
| 54 | * |
| 55 | * Allows the transport to be easily replaced with long-polling. |
| 56 | * |
| 57 | * @since 3.6.0 |
| 58 | * |
| 59 | * @param array|object $response The no-priv Heartbeat response. |