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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 |
|---|---|
| 205 | * Returning a truthy value, or one that could be evaluated as a WP_Error |
| 206 | * will effectively short-circuit the installation, returning that value |
| 207 | * instead. |
| 208 | * |
| 209 | * @since 2.8.0 |
| 210 | * |
| 211 | * @param bool|WP_Error $response Response. |
| 212 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 213 | */ |
| 214 | $res = apply_filters( 'upgrader_pre_install', true, $hook_extra ); |
| 215 | if ( is_wp_error($res) ) |
| 216 | return $res; |
| 217 | |
| 218 | //Retain the Original source and destinations |
| 219 | $remote_source = $source; |
| 220 | $local_destination = $destination; |
| 221 | |
| 222 | $source_files = array_keys( $wp_filesystem->dirlist($remote_source) ); |
| 223 | $remote_destination = $wp_filesystem->find_folder($local_destination); |