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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 |
---|---|
3284 | * |
3285 | * @since 3.7.0 |
3286 | * |
3287 | * @param bool $send Whether to send the email. Default true. |
3288 | * @param string $type The type of email to send. Can be one of |
3289 | * 'success', 'fail', 'critical'. |
3290 | * @param object $core_update The update offer that was attempted. |
3291 | * @param mixed $result The result for the core update. Can be WP_Error. |
3292 | */ |
3293 | if ( 'manual' !== $type && ! apply_filters( 'auto_core_update_send_email', true, $type, $core_update, $result ) ) |
3294 | return; |
3295 |
|
3296 | switch ( $type ) { |
3297 | case 'success' : // We updated. |
3298 | /* translators: 1: Site name, 2: WordPress version number. */ |
3299 | $subject = __( '[%1$s] Your site has updated to WordPress %2$s' ); |
3300 | break; |
3301 |
|
3302 | case 'fail' : // We tried to update but couldn't. |