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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 |
|---|---|
| 5848 | * Filters whether to preempt the XML-RPC media upload. |
| 5849 | * |
| 5850 | * Passing a truthy value will effectively short-circuit the media upload, |
| 5851 | * returning that value as a 500 error instead. |
| 5852 | * |
| 5853 | * @since 2.1.0 |
| 5854 | * |
| 5855 | * @param bool $error Whether to pre-empt the media upload. Default false. |
| 5856 | */ |
| 5857 | if ( $upload_err = apply_filters( 'pre_upload_error', false ) ) { |
| 5858 | return new IXR_Error( 500, $upload_err ); |
| 5859 | } |
| 5860 | |
| 5861 | $upload = wp_upload_bits($name, null, $bits); |
| 5862 | if ( ! empty($upload['error']) ) { |
| 5863 | /* translators: 1: file name, 2: error message */ |
| 5864 | $errorString = sprintf( __( 'Could not write file %1$s (%2$s).' ), $name, $upload['error'] ); |
| 5865 | return new IXR_Error( 500, $errorString ); |
| 5866 | } |