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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 |
|---|---|
| 519 | * |
| 520 | * @since 2.8.0 |
| 521 | * @since 4.4.0 The $hook_extra parameter became available. |
| 522 | * |
| 523 | * @param string $source File source location. |
| 524 | * @param string $remote_source Remote file source location. |
| 525 | * @param WP_Upgrader $upgrader WP_Upgrader instance. |
| 526 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 527 | */ |
| 528 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] ); |
| 529 | |
| 530 | if ( is_wp_error( $source ) ) { |
| 531 | return $source; |
| 532 | } |
| 533 | |
| 534 | // Has the source location changed? If so, we need a new source_files list. |
| 535 | if ( $source !== $remote_source ) { |
| 536 | $source_files = array_keys( $wp_filesystem->dirlist( $source ) ); |
| 537 | } |