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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 |
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481 | * |
482 | * Returning a value that could be evaluated as a `WP_Error` will effectively |
483 | * short-circuit the installation, returning that value instead. |
484 | * |
485 | * @since 2.8.0 |
486 | * |
487 | * @param bool|WP_Error $response Installation response. |
488 | * @param array $hook_extra Extra arguments passed to hooked filters. |
489 | */ |
490 | $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); |
491 |
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492 | if ( is_wp_error( $res ) ) { |
493 | return $res; |
494 | } |
495 |
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496 | // Retain the original source and destinations. |
497 | $remote_source = $args['source']; |
498 | $local_destination = $destination; |
499 |
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