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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 |
|---|---|
| 6400 | * Filters whether to preempt the XML-RPC media upload. |
| 6401 | * |
| 6402 | * Passing a truthy value will effectively short-circuit the media upload, |
| 6403 | * returning that value as a 500 error instead. |
| 6404 | * |
| 6405 | * @since 2.1.0 |
| 6406 | * |
| 6407 | * @param bool $error Whether to pre-empt the media upload. Default false. |
| 6408 | */ |
| 6409 | $upload_err = apply_filters( 'pre_upload_error', false ); |
| 6410 | if ( $upload_err ) { |
| 6411 | return new IXR_Error( 500, $upload_err ); |
| 6412 | } |
| 6413 | |
| 6414 | $upload = wp_upload_bits( $name, null, $bits ); |
| 6415 | if ( ! empty( $upload['error'] ) ) { |
| 6416 | /* translators: 1: File name, 2: Error message. */ |
| 6417 | $errorString = sprintf( __( 'Could not write file %1$s (%2$s).' ), $name, $upload['error'] ); |
| 6418 | return new IXR_Error( 500, $errorString ); |