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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 |
|---|---|
| 575 | * |
| 576 | * @since 2.8.0 |
| 577 | * @since 4.4.0 The $hook_extra parameter became available. |
| 578 | * |
| 579 | * @param string $source File source location. |
| 580 | * @param string $remote_source Remote file source location. |
| 581 | * @param WP_Upgrader $upgrader WP_Upgrader instance. |
| 582 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 583 | */ |
| 584 | $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] ); |
| 585 | |
| 586 | if ( is_wp_error( $source ) ) { |
| 587 | return $source; |
| 588 | } |
| 589 | |
| 590 | if ( ! empty( $args['hook_extra']['temp_backup'] ) ) { |
| 591 | $temp_backup = $this->move_to_temp_backup_dir( $args['hook_extra']['temp_backup'] ); |
| 592 | |
| 593 | if ( is_wp_error( $temp_backup ) ) { |