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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 |
---|---|
269 | * Filter whether the upgrader cleared the destination. |
270 | * |
271 | * @since 2.8.0 |
272 | * |
273 | * @param bool $removed Whether the destination was cleared. |
274 | * @param string $local_destination The local package destination. |
275 | * @param string $remote_destination The remote package destination. |
276 | * @param array $hook_extra Extra arguments passed to hooked filters. |
277 | */ |
278 | $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $hook_extra ); |
279 |
|
280 | if ( is_wp_error($removed) ) |
281 | return $removed; |
282 | else if ( ! $removed ) |
283 | return new WP_Error('remove_old_failed', $this->strings['remove_old_failed']); |
284 | } elseif ( $abort_if_destination_exists && $wp_filesystem->exists($remote_destination) ) { |
285 | //If we're not clearing the destination folder and something exists there already, Bail. |
286 | //But first check to see if there are actually any files in the folder. |
287 | $_files = $wp_filesystem->dirlist($remote_destination); |