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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 |
|---|---|
| 444 | /** |
| 445 | * Filter the source file location for the upgrade package. |
| 446 | * |
| 447 | * @since 2.8.0 |
| 448 | * |
| 449 | * @param string $source File source location. |
| 450 | * @param string $remote_source Remove file source location. |
| 451 | * @param WP_Upgrader $this WP_Upgrader instance. |
| 452 | */ |
| 453 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this ); |
| 454 | if ( is_wp_error( $source ) ) { |
| 455 | return $source; |
| 456 | } |
| 457 | |
| 458 | // Has the source location changed? If so, we need a new source_files list. |
| 459 | if ( $source !== $remote_source ) { |
| 460 | $source_files = array_keys( $wp_filesystem->dirlist( $source ) ); |
| 461 | } |
| 462 | /* |