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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.
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459 | * Returning a truthy value, or one that could be evaluated as a WP_Error |
460 | * will effectively short-circuit the installation, returning that value |
461 | * instead. |
462 | * |
463 | * @since 2.8.0 |
464 | * |
465 | * @param bool|WP_Error $response Response. |
466 | * @param array $hook_extra Extra arguments passed to hooked filters. |
467 | */ |
468 | $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); |
469 |
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470 | if ( is_wp_error( $res ) ) { |
471 | return $res; |
472 | } |
473 |
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474 | //Retain the Original source and destinations |
475 | $remote_source = $args['source']; |
476 | $local_destination = $destination; |
477 |
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