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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 |
---|---|
6405 | * Filters whether to preempt the XML-RPC media upload. |
6406 | * |
6407 | * Returning a truthy value will effectively short-circuit the media upload, |
6408 | * returning that value as a 500 error instead. |
6409 | * |
6410 | * @since 2.1.0 |
6411 | * |
6412 | * @param bool $error Whether to pre-empt the media upload. Default false. |
6413 | */ |
6414 | $upload_err = apply_filters( 'pre_upload_error', false ); |
6415 | if ( $upload_err ) { |
6416 | return new IXR_Error( 500, $upload_err ); |
6417 | } |
6418 |
|
6419 | $upload = wp_upload_bits( $name, null, $bits ); |
6420 | if ( ! empty( $upload['error'] ) ) { |
6421 | /* translators: 1: File name, 2: Error message. */ |
6422 | $errorString = sprintf( __( 'Could not write file %1$s (%2$s).' ), $name, $upload['error'] ); |
6423 | return new IXR_Error( 500, $errorString ); |