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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 |
|---|---|
| 123 | $scripts->add( 'heartbeat', "/wp-includes/js/heartbeat$suffix.js", array('jquery'), false, 1 ); |
| 124 | did_action( 'init' ) && $scripts->localize( 'heartbeat', 'heartbeatSettings', |
| 125 | /** |
| 126 | * Filter the Heartbeat settings. |
| 127 | * |
| 128 | * @since 3.6.0 |
| 129 | * |
| 130 | * @param array $settings Heartbeat settings array. |
| 131 | */ |
| 132 | apply_filters( 'heartbeat_settings', array() ) |
| 133 | ); |
| 134 | |
| 135 | $scripts->add( 'wp-auth-check', "/wp-includes/js/wp-auth-check$suffix.js", array('heartbeat'), false, 1 ); |
| 136 | did_action( 'init' ) && $scripts->localize( 'wp-auth-check', 'authcheckL10n', array( |
| 137 | 'beforeunload' => __('Your session has expired. You can log in again from this page or go to the login page.'), |
| 138 | |
| 139 | /** |
| 140 | * Filter the authentication check interval. |
| 141 | * |