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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 |
|---|---|
| 239 | /** |
| 240 | * Filter the source file location for the upgrade package. |
| 241 | * |
| 242 | * @since 2.8.0 |
| 243 | * |
| 244 | * @param string $source File source location. |
| 245 | * @param string $remote_source Remove file source location. |
| 246 | * @param WP_Upgrader $this WP_Upgrader instance. |
| 247 | */ |
| 248 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this ); |
| 249 | if ( is_wp_error( $source ) ) { |
| 250 | return $source; |
| 251 | } |
| 252 | |
| 253 | // Has the source location changed? If so, we need a new source_files list. |
| 254 | if ( $source !== $remote_source ) { |
| 255 | $source_files = array_keys( $wp_filesystem->dirlist( $source ) ); |
| 256 | } |
| 257 | /* |