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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 |
|---|---|
| 591 | * |
| 592 | * @since 3.7.0 |
| 593 | * |
| 594 | * @param bool $send Whether to send the email. Default true. |
| 595 | * @param string $type The type of email to send. Can be one of |
| 596 | * 'success', 'fail', 'critical'. |
| 597 | * @param object $core_update The update offer that was attempted. |
| 598 | * @param mixed $result The result for the core update. Can be WP_Error. |
| 599 | */ |
| 600 | if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) |
| 601 | return; |
| 602 | |
| 603 | switch ( $type ) { |
| 604 | case 'success' : // We updated. |
| 605 | /* translators: 1: Site name, 2: WordPress version number. */ |
| 606 | $subject = __( '[%1$s] Your site has updated to WordPress %2$s' ); |
| 607 | break; |
| 608 | |
| 609 | case 'fail' : // We tried to update but couldn't. |