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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 |
|---|---|
| 482 | * |
| 483 | * Returning a value that could be evaluated as a `WP_Error` will effectively |
| 484 | * short-circuit the installation, returning that value instead. |
| 485 | * |
| 486 | * @since 2.8.0 |
| 487 | * |
| 488 | * @param bool|WP_Error $response Installation response. |
| 489 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 490 | */ |
| 491 | $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); |
| 492 | |
| 493 | if ( is_wp_error( $res ) ) { |
| 494 | return $res; |
| 495 | } |
| 496 | |
| 497 | // Retain the original source and destinations. |
| 498 | $remote_source = $args['source']; |
| 499 | $local_destination = $destination; |
| 500 | |