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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 |
|---|---|
| 588 | * |
| 589 | * @since 2.8.0 |
| 590 | * @since 4.4.0 The $hook_extra parameter became available. |
| 591 | * |
| 592 | * @param string $source File source location. |
| 593 | * @param string $remote_source Remote file source location. |
| 594 | * @param WP_Upgrader $upgrader WP_Upgrader instance. |
| 595 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 596 | */ |
| 597 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] ); |
| 598 | |
| 599 | if ( is_wp_error( $source ) ) { |
| 600 | return $source; |
| 601 | } |
| 602 | |
| 603 | if ( ! empty( $args['hook_extra']['temp_backup'] ) ) { |
| 604 | $temp_backup = $this->move_to_temp_backup_dir( $args['hook_extra']['temp_backup'] ); |
| 605 | |
| 606 | if ( is_wp_error( $temp_backup ) ) { |