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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 |
|---|---|
| 233 | /** |
| 234 | * Filter the source file location for the upgrade package. |
| 235 | * |
| 236 | * @since 2.8.0 |
| 237 | * |
| 238 | * @param string $source File source location. |
| 239 | * @param string $remote_source Remove file source location. |
| 240 | * @param WP_Upgrader $this WP_Upgrader instance. |
| 241 | */ |
| 242 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this ); |
| 243 | if ( is_wp_error($source) ) |
| 244 | return $source; |
| 245 | |
| 246 | //Has the source location changed? If so, we need a new source_files list. |
| 247 | if ( $source !== $remote_source ) |
| 248 | $source_files = array_keys( $wp_filesystem->dirlist($source) ); |
| 249 | |
| 250 | // Protection against deleting files in any important base directories. |
| 251 | // Theme_Upgrader & Plugin_Upgrader also trigger this, as they pass the destination directory (WP_PLUGIN_DIR / wp-content/themes) |