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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 |
|---|---|
| 637 | * |
| 638 | * @since 3.7.0 |
| 639 | * |
| 640 | * @param bool $send Whether to send the email. Default true. |
| 641 | * @param string $type The type of email to send. Can be one of |
| 642 | * 'success', 'fail', 'critical'. |
| 643 | * @param object $core_update The update offer that was attempted. |
| 644 | * @param mixed $result The result for the core update. Can be WP_Error. |
| 645 | */ |
| 646 | if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) { |
| 647 | return; |
| 648 | } |
| 649 | |
| 650 | switch ( $type ) { |
| 651 | case 'success': // We updated. |
| 652 | /* translators: Site updated notification email subject. 1: Site title, 2: WordPress version. */ |
| 653 | $subject = __( '[%1$s] Your site has updated to WordPress %2$s' ); |
| 654 | break; |
| 655 | |